FWIW, mine works well: its a Griffin "iTrip AutoPilot with SmartScan." (3-in-1 Charger, FM transmitter, and playback controls.) Occasionally when I first plug in, it pops up a message about not being compatiblebut when it happens I ignore it and everything works. My iPhone 3G did the same thing anyway.
It can even control Pandora!
Note that this is not a current Griffin modelthe one I have is about 2 years old and I dont see this exact model available anymore.
I do find it doesnt charge very fastbut then the 4 has a bigger battery, and Im now running Navigon GPS plus Pandora all the time, so thats to be expected. At least it keeps the battery from draining while used this way.
As for
static, these tips helped me get great sound:
1. Ignore the SmartScan recommended station(s). Find a good one on your own. The one I found is actually not 100% empty, it has a radio station that comes and goes. But for whatever reason, iTrip overpowers it without fail. Supposedly, stations in the middle of the scale are better separated than really high or low stations; the good one I found was in the high 90s (medium-sized American city.
2. If youre in the US, put the iTrip into european mode (or whatever youd call it); the method varies by modelsometimes holding a button or two for a time. This opens up additional stations (in-between stations, and little-used stations at the low endwhich are often great except in my area someones using them!) But it also boosts the power! This is not documented anywhere that I can find, but the SAME station, once put into euro mode, drowns out noise much better. This may or may not still be true of newer models. (But my model DID come after the FCC required power to be reduced; which explains why this mode would be hidden.)
3. Lower or remove your cars external antenna. iTrip doesnt need it, and it feeds interference. And I can still get some local stations if I really careor stream them over the Internet
