I recently bought and installed a 4200nex which replaced my older avh-p4400bt. I bought the 4200 mainly because I liked my 4400 and I'd read many good reviews, but I am severely disappointed. This new unit is very slow and lags with any touch input. When I press the home button I can count to 3 or 4 before it switches. Volume is the same, I'll try to turn the volume up, nothing happens, I press volume up more and then it will suddenly shoot up. Carplay is also very slow, I'll press an app and then wait for it to open. This is with a 7+ so I know it's not my phone slowing things down.