Here's my quick review:
The build quality is really nice. Yes, its a bit heavy but you get used to it pretty quickly. I was able to game for hours last night in bed no problem. Analog sticks, triggers, buttons, I really like the feel of all of them. Getting head shots in Dead Trigger is so much fun and cooler than with touch controls.
The screen is beautiful. Yes, a little too small for my tastes but everything is bright and crisp. Some of the text is very difficult to see though, reading the text in a game like zombie driver is very hard since it's so tiny. Its still a very nice screen though.
Emulation is fantastic. It plays everything really well. N64 games run better than any other android device I've owned but its still hit and miss. Everything else is flawless. Actually, the only downside is that for the emulators I own the triggers and 2nd analog can't be mapped. Still plenty of buttons, you can map the L3 and R3 buttons too.
Overall I love this thing. It's not perfect but its got a very good build, beautiful screen, and nice controls. I even bought a used gtx 650 card for 90 bucks and can't wait to start streaming my steam games next week.