TYP, that makes me cry. I had bought the Sonic 3 & Knuckles/Sonic CD PC discs because they were cheaper than the Mega Collection and had the games I really wanted to play. The Sonic 3 discs worked, which is good, but the Sonic CD one didn't. Now that I know that it won't ever work on my PC, I suppose I can use it as a disc or something.
I might pick up Gems collection. I haven't played Sonic CD, and people say it's the best. I still love Sonic 3 + Knuckles, so it might be hard to top that. Still, I remember fond times with Vectorman, seizure flashes or not.