I got mine about a week ago as well. I've played with it a bit, and I really like it. I have been using the AVS and I do think the NT provides a sharper picture, but I play on a large high quality TV and sit closer than I probably should. Sitting 12 feet away I'm not sure I see much of a difference.
I haven't had time to jailbreak or play with the interface much - maybe over Christmas I'll do some tweaking.
One negative, and I've seen a lot of people talk about this online, the NES cart slot is loose. The cart is surprisingly wiggly in there when it's connected. It isn't a big deal to me as nothing is near it while I play, and I use the 8bitdo controllers. But I wonder if using a wired connection and jerking it the wrong way could cause the cart to move and mess up the game...or worse. Either way, definitely not a deal breaker, but for $500 I'm a little surprised.