It works great. I've been playing pokemon leaf green and advance wars on my G2, and I forget I'm not using a game boy sometimes. One thing, I'm not sure what kind of limitation causes this, but for gameboid at least, the keyboard seems to not register more than two button inputs at once, so it's not too great for action games. Graphics wise it's flawless, I've seen videos of people playing chrono cross just fine... I haven't done it myself cuz those games take up like 4 gigs, but its possible.