What I have noticed is that the sound quality is not the greatest. You are able to hear a crackling through the speakers in the car. So far, I have only used it for playing Pandora, I will test it with music from my SD card later on today.

Also, the sound quality on the speaker phone is so so. people are able to understand you, but it sounds a little like you were in a tunnel..

Update:

The Speaker phone is useless at high speeds. I drive a Maxima, pretty well insulated, but the road noise is so much that it sucks when over 45 MPH.

The sound quality issue on the Pandora is caused by my Blackberry Pearl. On my friend's iPhone the quality is great! I guess it is time for a new phone....
What I have noticed is that the sound quality is not the greatest. You are able to hear a crackling through the speakers in the car. So far, I have only used it for playing Pandora, I will test it with music from my SD card later on today. Also, the sound quality on the speaker phone is so so. people are able to understand you, but it sounds a little like you were in a tunnel.. Update:

The Speaker phone is useless at high speeds. I drive a Maxima, pretty well insulated, but the road noise is so much that it sucks when over 45 MPH. The sound quality issue on the Pandora is caused by my Blackberry Pearl. On my friend's iPhone the quality is great! I guess it is time for a new phone....