If San Andreas had a weak point, it was the soundtrack. I can only imagine that Rockstar ran into licensing issues because when you think of the 90s it's easy to think of several bands and songs that are mysteriously absent.
This CD set is only a small subset of the full San Andreas soundtrack heard in game. It's strange not seeing Cult Of Personality and Welcome To The Jungle on the CD as the latter worked really well with the games trailer and the former is one of the better tracks to play the game to.
Maybe the main reason to buy this is for “The Introduction”, or if you are a huge fan of GTA and San Andreas in particular. In fact considering you can listen to the ENTIRE soundtrack if you own the game(by going into the Audio Options and selecting your radio station of choice) it's probably the only reason to get this.
With that in mind, if you don't own San Andreas yet wait a while as “The Introduction” will be appearing on the new edition of San Andreas.