Seems like a competent port.
I don't know, man. Going back and playing these old Sega games is breaking my heart. I'm starting to see what Jeff was talking about in the Nights into Dreams Quick Look about the excessive love people had for Sega. Not to say they weren't doing great things--at the time, they were even more innovative than Nintendo--but their games don't hold up in terms of playability. Sonic's awkward levels and controls just disappoint in comparison to a Super Mario 64, and anyone who doesn't see that is still blinded by Sega's charm.