The system is slightly wider than an NES cartridge and about twice as deep. This makes it thicker than most handhelds but still thinner than the Nomad. It's lighter than a DS but heavier than a GBA. With an NES cartridge inserted the weight is still down at the console, so the fact you have that mondo cart peeking over the top doesn't matter. In terms of feel I had no problems playing either Mega Man 2 or Super Mario Bros. The D-pad looks like the Playstation style; however, the buttons are not raised nearly as far and as a result it's much more comfortable. The colors are spot on; I couldn't tell the difference between it and the actual NES. It also features a TV out (yellow and white) for when you get to your destination, and a pair of wireless controllers (very close to the SNES controllers) and a wireless zapper. I haven't tested any of the wireless stuff, since it wasn't a selling point.
The negatives: first, the screen doesn't quite match the proper dimensions of the NES. It's a bit too wide, so you'll notice a bit of stretch. You quickly stop noticing it, and it really only is noticable when you're seeing squares or characters you are intimately familiar with (Mega Man, etc). And even so, once I started playing I stopped caring. It isn't as bad as when people stretch a 4:3 picture to 16:9 because they hate black bars, for example. Secondly, there is a slight amount of blurring as you move. It's not nearly as bad as the Gameboy, but it is noticable. Once again, this never hampered me in playing Mario and Mega Man, whereas their counterparts on the Gameboy tended to kill me thanks to the major blur when I moved fast.
I'm not sure what the battery life is. I've heard around 8-9 on 4x AAs, which isn't bad. If you're interested in portable NES gaming and don't want to mod an NES Ben Heck style then I'd say get this.
