Like me a pbj have been saying all along, it's the most painless way to play emulated games on the tv. The interface is pretty great, the emulation is good, it boots up and shuts down quicker than anything out there, ect. And if you don't like the emulation, ect it's been hacked so run something else on it. The hacks are integrated pretty well... it doesn't feel butchered if you apply them.
The only complaint I've been able to come up with, and it's a stretch, is that if you are using save states extensively (saving every few minutes in a game ect.) and you don't pay attention to what you are doing it's fairly easy to accidentally load up an older save when in the save menu. Also the thing about having to press the reset button is a pain, but a quick re-flash of the kernel will allow you to map it to a key combo on the gamepad.
Hey if we can't get ahold of them, somebody make a 3d model of a snes case for the nes/famicom classic and I'll print us out a few. I've been ashamed of my initial results, but I'm finally getting pretty good at this 3d printing business. The trick seems to be figuring out the best way to lay out the part on the bed to avoid a lot of hard to remove supports.