0ur opinion: :The sleek Sportster4 includes SlRlUS Replay, advanced sports features, a large, easy-to-read display, rotary tuning knob and moves easily between your car, home or boombox with universal docking capability.
:Get in the game with the plug-and-play Sirius Sportster 4 satellite radio receiver, which sports a new slim profile while still maintaining the same great features for which the Sportster series is known. Just like other Sirius-compatible receivers, the Sportster 4 offers a large, easy-to-read display, a rotary tuning knob, and accessible buttons, but now moves seamlessly into your car, home, or boombox. More significantly, the Sportster 4 maximizes the listening experience of Sirius radio's broad sports lineup, with the ability to decode the incoming Sirius digital-quality signal from more than 120 music, news, and sports channels. lt's also easily transportable, and thanks to the bundled car kit, lets you listen to your favorite satellite radio programs while driving.
An easy-to-read, six-line display tells you the channel name and number, category, artist name, song title, and time simultaneously. The receiver also lets you program up to 30 presets of your favorite streams, as well as search by stream, artist name, song title, or category. And with a quick press of the 0ne-Touch Jump button, you can instantly switch between the traffic and weather reports for your city or any of the other music, news, or entertainment channels. 0ther programming details include an S-Seek function that stores your favorite artists and songs and alerts you when one is playing on any of the music channels, direct station tuning via the numeric buttons, and a channel lock option. Time functions, meanwhile, include an onscreen clock, alarm, and sleep timer, as well as a program alert that allows the unit to switch to a preprogrammed stream at a selected time.
The Sportster 4 really earns its stripes, however, with its variety of enhanced features designed specifically for sports lovers. The Game Alert feature prompts you when your favorite NFL or other sports teams are playing on Sirius. The Game Zone lists all of your favorite teams in one virtual category and lets you select a different team from each of the various sports leagues, including the NFL, NBA, NHL, and college sports. And what sports fan could do without the Sportster's instant replay function, which lets you pause, rewind, and replay 44 minutes of live radio? As soon as you tune to a channel, the receiver automatically begins storing the audio for later playback.
The Sportster 4 also includes a built-in FM transmitter that sends Sirius radio programming to your vehicle's FM tuner, so you don't have to make a direct connection to enjoy the full array of channels. Simply set an empty FM frequency on your radio and tune the Sportster 4 to the same frequency. This function also works with other FM tuners, such as the one on your home stereo, but is easily paired with the car thanks to the bundled vehicle kit, which includes everything you need for listening to Sirius while driving. Components include a vehicle docking station, a suction cup mount, a vent mount, a DC power supply that plugs into your car's cigarette lighter, a roof-mount antenna, and mounting hardware.
Sirius satellite radio is a subscription service that provides more than 120 channels of programming, from digital-quality music to news, talk, and sports. lt is available only in the lower 48 states--not in Alaska, Hawaii, or U.S. territories. The Sportster 4, which measures 4.5 by 2.9 by 0.6 inches (W x H x D), is backed by a one-year warranty.
What's in the Box Sportster 4 satellite radio receiver, wireless remote control, lithium battery, vehicle docking station, roof-mount antenna, suction cup mount, vent mount, cigarette lighter power adapter, mounting hardware, installation guide, Sirius channel information card, user's manual.
Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* SIRIUS Sporster 4 ...
Got this SIRIUS radio as a christmas gift and instantly had it installed in my vehicle. Docking station is hardwired to my radio receiver and broadcast programming on channel 88.1 FM.
I have had absolutely no problems with this unit and can say that I am very happy with it. Sound quality is great and there is no disturbance to speak of.
Very bright and easy to read display and fully functioning remote makes it easy to channel surf while driving which is great as there are quite a few genres to choose from.
I would recommend this unit to anyone interested in making the purchase
Buyer's feedback: 
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Great Radio
I bought this for my boyfriend...and was not sure if he will like it. But now, I think I have lost him to this GREAT product by Sirius. Although, it would be great if there was a channel for the latest songs.
Buyer's feedback: 
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* Deceptive Company, Terrible Customer Service ...
DISREPSECTFUL AND DECEPTIVE -- I purchased a Sirius Radio for my husband for Christmas. The company offered a promotional package that included the radio and a $50 gift card to be used towards the monthly subscription cost. When my husband called to activate the radio the sales Rep immediately began to sell us $400 subscription packages, quote exorbitant activation fees ($50). I was appalled that the entire gift card was going to the activation!! There was absolutely no mention of the fee when I purchased. When my husband began to question the charges, the supervisor was consulted and suddenly the fee disappeard. I am sure that if we had not protested we would have been charged..... Then after he decided on a subscription plan, additional enhancements were suddenly suggested to get "optimal service". The Rep basically suggested that the basic service was inadequate and we would have to pay additional charges (above and beyond the quoted subscription rates) to really enjoy the radio. That was the last straw and my husband decided to cancel everything. He felt very taken advantage of and the victim of a Rep that did not know what she was talking about. The process took about 45 minutes and we hung up with the intention to return everything.
Here is the kicker! Because the Sirius Rep asked us to scratch the $50 gift card during the activation process, it is now void.... When I called to see if we could get the full amount refunded, since it was due to their very poor customer service, incompetence and deceptive practices, that we canceled, the customer service supervisor gave me attitude. He even agreed that the $50 was never used and was sitting in our account. However it was our fault...... When I asked for his name so that I could write a letter of protest to management he told me it was pointless and that I could not "bend the company to my will" simply because I was upset. I told him that maybe everyone up the chain would deny my request, but that I had a right as a consumer to complain if I wanted to. He refused to give me his name, as my case did not "warrant" divulging personal information. I was insulted by his direspectful and condescending tone. He did even see fit appologize for our initial negative experience with the company...
Bottome line -- I think this company is deceptive and disrespectful. I am stuck with a $50 gift card I can never use and a terrible opinion of this company. I feel that in each instance our complaints should have been dealt with professionally and with respect. Please think twice before doing business with a company who treats their customers this was!
Buyer's feedback: 
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Great radio!
Overall, a great radio. I do not really care for too much sports, but like the large bright display, which is very convenient while driving. I also have a Starmate, which works well in the house, but I like this radio better for car use. Nice sound, easy to access controls (I'm always channel surfing), bright & easy-to-read display, and very easy installation (I did not use the FM modulator). Just to add one "complaint", I would like an extended suction cup mount.
Looking at other reviews, it looks like last year's models were below par. Make sure you note the dates on any poor reviews before you take their comments to heart.
Buyer's feedback: 
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* One flaw ...
Here is the condensed version...
The Sportster 4 is a sexy unit ('bout the size of a deck of cards held sideways) and the features are great. The one flaw is that it is ABSOLUTELY NECESSARY to buy the fm relay adapter. That really disappointed me because here I am buying the unit (which is not cheap to begin with) and it's labeled plug and play. Well, you can plug it in, but it sure won't play because you'll get a signal is almost non-existant and a sound that rivals two dixie cups and a string. I wish Sirius had been up front and let it be known that the adapter ($18-$30) is a necessity. Either that or just include the adaptor itself in the package and tack on the extra cost. I would have gave the unit a perfect review, but I won't because of the fm adaptor issue. Having said that... when the Geek Squad at Best Buy installed the fm adaptor, it was like the heavens opened up and the sun was shining again. It's a beautiful thing- NO INTERFERENCE and crystal clear sound.