Sorry to dredge up a thread, but add me to the terrible BT quality list. Every person I've ever talked to on it has said they can barely understand me. Almost no point in having it because I hate having to yell and repeat myself all the time.
Not sure if it's due to the excessive road noise or what. My '07 3-series was much quieter inside and the BT worked much better as well. People didn't have a problem hearing me at all.