it's actually decent. it doesn't have the most accurate NES emulation (SMB3 still has fuxed sprite layers, etc), but it definitely does the job. supports all sorts of weird games (color dreams, tengen, solar jetman, etc) without any major problems. SNES emulation works well (only tested Yoshi's Island, Final Fantasy III US, and SSF2), and Genesis works pretty damn well (haven't seen anything that's inaccurate).
they're selling them
down the street for $59 CAD. decent price, IMO.