THIS VERSION OR TRANSFORMED-VERSION: WHICH TO BUY?
Firstly, let me say if you are only interested in a SINGLE-PLAYER experience, then get this game and rather than TRANSFORMED. This game is arguably superior in at least one aspect: it has context-sensitive race announcer! If you are torn between THIS VERSION or TRANSFORMED, start with this one--it's a great game and you will not be disappointed. I have played Transformed on two other platforms so I can stand by this review. That being said, if you want multiplayer, get Transformed.
Sonic & SEGA All-Stars Racing is a brilliant kart racer and nearly as good as any MARIO KART racer. It's the only Kart Racer that I keep coming back to (e.g., I have purchased this game on three different platforms). This game is bug-free (as of 11-1-2014) and runs beautifully on my gaming laptop.
+ Creative, fun, and colorful course designs (the underwater ancient ruins is a particular fav of mine)
+ Addictive and catchy music
+ Stellar character models and animation
+ Unique and varied voice acting
+ Infinite replayability and variety
+ Seamless controller support
+ Several difficulty settings to maintain challenge over-time
+ Local multiplayer
- No online multiplayer support
If you are a fan of Kart Racers, than this game is a must-buy!