I've used 2 Parrot kits, CK3100 and CK3000 and they were both awesome!
Highly recommend that company for BT handsfree, you won't regret it.
I think the only time people have problems is when they try to do the wiring without purchasing a kit.
Check out:
http://www.parrotkits.com
Definitely worth it, makes it a plug and play install.