Others say...

"TuneCast"
Works wells when no other stations are close. Too many stations in my area, I had to keep changing frequencies.

"Not for use in congested regions"
This is a good FM transmitter, but all FM transmitters are the worst solution to the problem. BEST: a phono plug line-input on the car stereo. NEXT BEST: cassette adapter. I compared the Belkin model to the iTrip (2005). The Belkin was slightly more powerful, and came with an easy-to-use digital readout and station-setting buttons. iTrip also realised that these were needed and include them on their newer products. Ease of use - Belkin TuneCase II wins hands down. Well made. And with the F8V7067-APL Mobile Power Cord you don't eat up batteries (and this cable can run an iPod from the car battery). But you have cables all over the place - along with my phone charger, bluetooth earpiece adapter charger and radar detector makes for a spaghetti-look.

But the real problem is in how poorly it actually gets sound from an MP3 player out of the speakers. It just about DOES NOT WORK. I use it ONLY for books on tape that I have loaded on a few knock-around MP3 players. The sound of speech is muffled (though intelligible), with a slight whine in the background akin to an old car cassette player. Music is almost unlistenable. Your MP3 player might be pumping out hi-fidelity, but it comes out of the radio like an old victrola. Another major problem is that in my area of NJ radio stations are so close together that there is no "empty frequencey" that you need to transmit on. And the Belkin doesn't go all the way to the very ends of the FM spectrum - the places radio stations HATE to be anyway. And when you do find the one space that works marginally well in one town, by the time you get 5 or 6 miles away, that space is filled by another station. You need to pull over and find another empty frequency. Good luck - it's harder than it seems.

Read the other reviews - the ones that warned ME about these same problems. I'll bet this thing would work acceptibly in an open space of Wyoming, but for the majority of us: save your money for a $99 replacement radio with line-input.

"buy the mobile power cord for better performance"
I took the TuneCast II on a road trip to Canada, and I had major problems getting reception all the way between Chicago and Toronto. It seemed to help if I was touching the unit, such as if it was in my lap. It also burned through batteries. Now that I bought a mobile power cord (//www.amazon.com/gp/product/B0001J3Q9W), it seems to ground the unit or something, and I never have problems with reception. The sound quality is decent, but not great. I have to turn up my radio considerably to pick up the sound. It's easy to work and does a decent job. Bypass this and plug directly into you auxiliary jack if your stereo has one.

"Works OK Within 3 Feet for the First Month or Two, Then Nada"
The unit must be right next to an antenna for it to give a rather low quality sound. I used it for talk radio, so it wasn't too bad. But then it totally crapped out after about 2 months. If you have money to throw away, then this is for you!!

"Less convenient than the radio "
Well, I bought this for use in my car because it is a battery operated transmitter and my cigarette lighter port is blown out. I thought it would be nice to listen to the ipod in my car, and my non-battery operated model works like a charm. Not so with this one. I know the fcc regulates fm transmitters to low power, but this is ridiculous. I only got a clear signal if I actually touched the transmitter to the car antenna. I thought it might be my car, but it did the same thing with the other three cars I tried. To make matters worse, as some of the previous reviews state, the batteries run out very rapidly, making it worthwhile to invest in duracell stock if you plan on using this product for extended periods of time. Overall very poor performance.