in response to DullTheater:
first time i went on the real drumset i felt quite comfortable, but the "sound" was very shocking when i hit the kit. and yes for sure the left leg is completely wasted for the game.
but regarding playng songs outside of those from the game, it wasn't a problem. once the gamer understands the many different styles of keeping a beat from the different songs in the game, it is only a simple matter of applying them to the songs he wants to play on the real drums.
eg: the game has many styles of music, from Jrock to death metal to jazz to pop. all of the hihat/bass/snare coordination played in the game is the real deal on the kit. that is probably the biggest advantage of playing the game, learning different styles and genres while having lots of fun.