Just received and installed in my Lexus RX330.  The sound quality is much better than other FM modulators I've tried in the past.  I found that I have to have my iPhone 4 at maximum volume and dial back the stereo volume to get the clearest sound.  I really like the flexibility of the mount and its ability to hold my iPhone in portrait or landscape mode.  What I don't like is the weak plug which is too short and too loose.  Every time I turn, the iPhone spins and faces downward.  Gonna give it a few wraps with electrical tape, but frankly I'm annoyed that I have to in the first place.  Another annoyance is all the external wires required to make this work and charge at the same time.  I would really prefer a model with an integrated iPhone/iPod dock plug to charge and input sound.

Addendum: Today I tried this unit in my 2003 F-150 Supercrew and found less of a spinning issue.  However, the short plug on the unit has a tendency to cause intermittent connection in the F-150's recessed 12V outlet.  I also discovered the FM transmitter now only works on the right channel--no left channel at all.  Griffin is coming out with a new bluetooth enabled dock for the iPhone so I will probably keep this one in the interim.  But frankly, this thing is mediocre at best.
Just received and installed in my Lexus RX330. The sound quality is much better than other FM modulators I've tried in the past. I found that I have to have my iPhone 4 at maximum volume and dial back the stereo volume to get the clearest sound. I really like the flexibility of the mount and its ability to hold my iPhone in portrait or landscape mode. What I don't like is the weak plug which is too short and too loose. Every time I turn, the iPhone spins and faces downward. Gonna give it a few wraps with electrical tape, but frankly I'm annoyed that I have to in the first place. Another annoyance is all the external wires required to make this work and charge at the same time. I would really prefer a model with an integrated iPhone/iPod dock plug to charge and input sound. Addendum: Today I tried this unit in my 2003 F-150 Supercrew and found less of a spinning issue. However, the short plug on the unit has a tendency to cause intermittent connection in the F-150's recessed 12V outlet. I also discovered the FM transmitter now only works on the right channel--no left channel at all. Griffin is coming out with a new bluetooth enabled dock for the iPhone so I will probably keep this one in the interim. But frankly, this thing is mediocre at best.