Summary: Excellent product. It is a definite improvement over previous versions of the Tunecast, which I have owned and used. I was amazed at the quality of the sound. It has excellent bass response as well as excellent treble response. Changing the frequency was simple to do on the go. I really like that it came with a plug-in power adapter. It puts out a stronger signal when plugged in vs. on its own battery power.
Summary: Belkin Tunecast III FM Transmitter is just junk, would not tune to channel, static not worth it unless you do the attenuator modification. The modification makes all the difference, clear static free audio.
Summary: Pros: You can use batteries or plug it into the car. The screen, preset buttons, headphone jack, etc. - the entire product works. Additionally, it has been durable. I've had it for roughly two years and it still works as well as the day I first got it. I used it daily to rarely, in hot weather to cold temperatures - this product has never faltered. I'm not careless, but I don't give it extra care in fear that it will break.
Summary: I know most of the reviews are pretty negative but it works half-decently for me. I drive a 2005 Ford Focus with the standard Ford issued radio. Since I don't drive on a daily basis, I did not want to spend the big bucks for a state-of-the-art car radio. I live in the Montreal (Quebec) area and so far the transmitter works OK on 81.1 FM. I drove a bit around the city and outside without the need to change FM channels (so far).
Summary: I've had a Belkin TuneCast II, the other model universal FM transmitter. But, this one works much better. The battery life seems to be at least 3 times longer. Also, most importantly, this model does not shut off after a few seconds. It stays on about 10 minutes. Now, if there is a short passage of a song or a semi-long gap between songs, I do not have to listen to static until (with the other model) the music kicks in again.
Summary: How do I even begin? I had such high hopes for this but was frustrated. The sound quality varies depending on where you drive, where you put it in the car and especially sounds bad when you first start the car, for no reason at all! No matter where you place it in the car, all you hear is just static! Please don't waste your money on this trash!