It plays really well on a slightly dodgey emulator- you know, one of those annoying installers where you have to decline 9 (I counted) crap bloatware software applications and toolbars before it will let you install the game. would It have been smooth on the megadrive? It runs at 60fps but that isn't what I mean. It's kind of hard to explain, it just flows and animates really well. It also seems to run slightly faster when set to US mode. I never got past the second level although I was 4 or so at the time!
I might try out a few Roms for this emulator and if they seem fun grab a megadrive off the bay.