So you guys removed base game content and you made us buy DLC for full experience? Foolishness Sega.... Foolishness...
OK now for the real review.
So i guess that this DLC replaces Dreamcast version of SA2 with GC one. Menus look better, character themes are enabled, Chao karate is available and bunch of 2P characters and levels.
Character themes: There are Sonic, Tails, Knuckles, Amy, Rouge, Ivo Robotnik(Eggman), and Shadow theme. Finally, i can listen to Kouji Yusa's awesome voice everywhere! But.... How the hell do i get Maria's theme!?
Chao Karate: Can't go wrong with Chao's!
2P battle: More awesome speed, treasure hunting, and mech battle levels. Now you can play as Tikal, Chaos, Metal Sonic, Amy, Dark Chao and Regular Chao. Too bad there is no online feature....
Overall: It's pretty cheap so you definitely can't go wrong with it. I would still prefer this to be in a game from beginning, but whatever, SA2 is legendary game and I'm still waiting for.... Number 3! Why nobody knows to count to 3? Half Life fans are still waiting and SA fans are also waiting. Sega, throw Sonic Boom in garbage and give me my god damn SA3!