The unit features a TV out, a headphone jack and has a regoin switch for those carts that have region locking. I can't comment on that as I dont think I have any region locked carts.
The unit is pretty small, but its quite thick so its very comfortable to hold in my large hands. However the case does feel a bit thin and cheap, not sure if it would withstand to much of a dropping.
I didnt find the sound as bad as everyone is making out - it is distorted but the tiny speaker pumps out a reasonable bassy noise.
The machine is very picky about dirty carts. The first game I tried was Golden Axe 2 and it kept freezing and crashing. I quick rub of the contacts later and it ran fine though.
The built in games are of a fairly low standard, one or two of them might hold your attention for half an hour or so but that is all. I can understand of people preferred the GenMobile for this reason but for me the screen size was more important as I would rather collect carts anyway. Overall I'm pleased with my purchase.
If there are any other UK gamers interested I recommend http://www.gamesboro.net/ Service was fast and cheap - £40 including shipping