Installed my 8400. Completely happy with this one. Im done with the nav units. This unit has a simple ui and functions well. Bt is great. The sound is clean. I like the sub output much better than the kenwood way. I have tried a new unit each year for five years now. I have no complaints for the 8400, of course, there are a small couple items I would like different, but, that is normal. Rear tilt would have been great. Highly recommend this unit.