Just tried mine for the first time, front passenger seat of a 2010 Toyota Corolla. Sound quality was not so great and it got lots of static as I moved it around about a 1 cubic foot area (above my lap). The FM transmitter just simply stopped working after a few minutes (sound started coming out of N900's speakers), and when I went back into the settings it still had the FM transmitter enabled, and still had the icon. I tried disabling and then re-enabling it, at which point the whole music player got really slow, nearly unresponsive, and FM transmitter still didn't work.