Yea, I'm using the high end Kenwood. I was jabbing the factory system and shattered the screen.
Bluetooth is flakey at best. Sometimes it'll connect in 30 seconds, sometimes it refuses.
All the sync stuff has a 1sec delay - sux.
Using the phone is nearly useless due to the echo delay.
You can't run your phone thru sync and have streaming thru the kenwood. It's two completely different 'systems' and they don't play nice.
I'd stick with the factory stereo if I were you until they get the bugs worked out.