The only downsidethat u get is that you lose the display. Also as with most aftermarket radios u lose the steering wheel controls, but u can buy an interface for that. You also need an interface if u want to keep your onstar. Remote start works fine as do all the other features. If you get the right harness you can hook up your factory stereo at any time to change settings. You can buy the kit anywhere it's the metra 99-3303. Hope this was helpful.