You don't get much for your money (each track appears 3 times as I different mix). That said, I like it very much. Rocker is GREAT!
Regarding the money issue, I traded for it used on lala.com, which was, I thought, a good way to get it without paying a lot for just five songs.
But I like it. I can't honestly say I've done a super close comparison of all the mixes, but it's nice to have three tracks that aren't on any GNR release, as well as the different version or "Anything Goes."