There are several discussion threads on the Parrot in this forum. Here is a decent comparison of the Parrot vs. OE Bluetooth vs. other systems. One key consideration is whether you have DSP. The Parrot will work with DSP, but not as smoothly as with a traditional stereo system.

Xoutpost.com - View Single Post - Buy Parrot bluetooth kit or add OEM bluetooth module

Given the recent discoveries of using a TCU for Bluetooth (versus the much more expensive ULF module), I would go with an OE system.

__________________
SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input