I own both the first and second generation Apple TVs but don’t plan on purchasing the new one anytime soon. The television in my living room doesn’t support 1080p inputs so the previous generation Apple TV will be just fine for now.
I have fallen in love with the new user interface. It worries me a little bit that Apple hasn’t found a UI they want to stick with yet — it seems like with every software iteration they’re debuting a new UI. I think every one of them has been an improvement upon the last but I wish that they would find one and stick with it.