On Wednesday I received the Gamebox I ordered about 3 weeks ago. I had no problems connecting it to my old CRT gaming TV and getting it going. The console is roughly the size of a Wii unit. The controller is a copy of a Playstation controller, so if you like those controllers you'll like this one. My Gamebox came with a flat-pronged 120v power supply suitable for North America.
Pros: it comes with the 60 games listed previously, all stored internally on its flash memory. The emulation quality seems reasonably good to me. I also loaded about 20 different GBA ROMs on a micro-SD card. They all ran well, including 3D games like VRally. I would say the quality of GBA emulation is as good or better than the Dingoo's native GBA emulator. Both "game saves" and save states seemed to work okay.
Cons: the composite output seems a bit muddy and fuzzy, with cross-hatching on diagonal lines. It's perfectly viewable for playing games, but could be better. The plastic casing for the console and the controller seems a bit thin and cheap; if you press hard on seams with your thumb, you can feel the plastic flex slightly. I think if you gave one to a small child who likes to bash things around, it wouldn't last that long.
I have not tried loading any other sorts of ROMs on the micro-SD card. I will give it a try this weekend, but since the manual doesn't talk about putting any ROMs other than GBA on the micro-SD, I doubt the Gamebox will run them.
I have not tried running any video files off the micro-SD card yet, but I'll try that as well. There is an AVI for the Avatar movie trailer in the internal storage. It seems to display that okay.
If you enjoy playing GBA games and want to try playing them on a larger screen, this machine might be for you. However, unless someone figures out a way to run other game formats from the micro-SD card, I can't recommend paying the $50+ for one.