Although every review or video that mentions it can run ps2 and gamecube. It can't. Also aethersx2 has been abandoned and is closed source. Also android sucks.
But so far its a really nice ps1 portable device. Usually I'd use my vita but I'm always worried about damaging it and they're not exactly in production so I wanted something more disposable with L2 and R2 buttons. Now i can play Abe's Odyssey/Exodus on the train :D
I mean, so, the Retroid 3+ is much more capable than it looks, and only about 150 bucks (USD). From what i gather, there isn't too much a difference between even a higher end emulation handheld and the Retroid (some games might benefit from higher end hardware, but unless you're dead set on running something specific chances are most wouldn't notice)