I found a review on CNET here
that had this to say;
"The Acura RL's Bluetooth hands-free system was easy to set up with a Cingular Treo 650, and the call quality seemed excellent with the test calls we placed. Call status is shown in a bright electrofluorescent display nestled at the bottom of the speedometer, rather than interrupting what's on the main LCD. The RL's hands-free system needs some updating in the phone-book department, as it can't copy over contacts from a cell phone. Its 50-entry phone book must be manually populated using voice commands and voice commands only."
That review was done in 2006 though, so maybe they have updated the bluetooth system since then.