Just received my GCW-Zero today. Wow, what a piece of shit! At least from a build-quality POV. The D-PAD is absolute rubbish, and the buttons stick. If you hate the NGX, stay well clear of the GCW-Zero!!!
I'd take a jail-broken NGX over this, any day!
Having said that, the GCW-Zero is starting to grow on me. Yes, the controls suck, the GUI is simply awful, but the quality of the emulators - and the screen - has impressed me! Good enough to pull out of my pocket on the train, anyway, and a little smaller than the NGX.