As eric7 said, assuming you don't get a defective unit, it's hard to imagine you could regret either. They're very nice looking TVs. Size is something a lot of people regret though. I was coming from a 47" which made 55" seem like it wasn't enough of an upgrade. And once I got to thinking 60", I convinced myself to just max it out at 65" and be done with it. Lol
Seriously though, I'm glad that I did. It was tough to look at the $800 increase from 55" to 65". But I'm also hoping it will last me five years like my 47" did. And I have no doubt that I'd have both second guessed myself and gotten upgrade fever a lot sooner with a smaller TV.