If so what do you think of it? I think it's a huge improvement over Episode 1. The physics are much more accurate (no more wall clinging or wonky running animation), the music is more Genesis-style, the level design is better (but there are still plenty of cheap deaths, like in all Sonic games).
Overall, the game is a solid retro-style Sonic game. It looks and plays very similar to the Genesis games, but it's not perfect. The special stages are also a great bit of nostalgia for those who loved Sonic 2.
My main gripe with the game is the connection problems while playing online co-op. Sometimes I can't find anyone to play with, and when I do, the game lags horribly. I've never had this problem with any of my other games on Wii, 3DS, or PS3, so it must be a server problem on SEGA's end.
It should be said that these problems only occur when playing with random people. When I played co-op with a PSN friend, the game flowed smoothly.