Works well:
-Super Mario World
-The Legend of Zelda: A Link to the Past
-Chrono Trigger
-Gradius III

Lags horribly or is choppy when framerate is changed:
-Mario Kart
-F-Zero
-F-Zero 2
-Starfox
-Kirby's Dream Land 3

Those are the only ones I've tested so far. When I get home from work tonight, I'm going to test more.