What a great little gem this is!
I was heavy with nostalgia when playing this one. Reminded of the great days of the Genesis and the Dreamcast when I was growing up. It's a nice change from the mostly rubbish Sonic games that came out these last years.
Caters to those like me that loved Sonic when he was the world's fastest side-scrolling hedgehog as well as those like my little brother who loved Sonic Adventure 1 and 2's crazy over-the-top action, cheesy music and story when he was a kiddo!
With the latest patch and the latest Nvidia drivers (295.51 beta at this time) it looks better and runs faster than the console versions and we're both enjoying Sonic's antics like we did when we were respectively 20 and 10 years younger (and frankly hadn't been able to since)!
Only one con: I wish I was 8 years old again. I'd have enjoyed this even more!