Hi ! I found some videos on how N64 run on SGS2, that might be interesting. It runs very well! YouTube - ‪[HD] N64 on Samsung Galaxy S2 [Super Smash Bros]‬‏
I have it on mine, indeed runs well! Especially love playing it with my bluetooth gamepad (Phonejoy). I purchased N64oid when it was on the Market before it got pulled, I've been in email contact with its dev and he's hoping to re-release the improved version to the Market by the end of this month.