Received mine early last week, also purchased through Groupon. Powered up, accessed Google Play, which immediately notified me that there was an update available. Followed the instructions ie accepted update, and immediately was able to download apps. Sorry most of you appear to have had problems but (touch wood) mine appears to be fine and I'm very pleased with it. I did try to download BBC iPlayer but after several attempts, realised that the Flash download just wasn't going to happen. Downloaded an app called BBC Media Player and lo and behold, BBC iPlayer works perfectly.
So again, one very happy bunny here :-))