Our 2012 Nexus 7 is basically useless since receiving 5.0 over a week ago. Slow, poor battery life, apps that won't work, screen locks, etc. Still haven't received 5.0.1 and I wish I'd never downloaded 5.0. However, our 2013 Nexus 7 seems to be fine. Not a great improvement from before but at least it's working.