I have a few of these and it is rare that I will find one where all or most of the versions are great. An exception is Jorn who has released Unlocking the Past and Heavy Rock Radio which are really great.

Some of the others have some brilliant versions of songs that are must-haves for me. Speed King / Yngwie and Stormbringer by John Norum & Glenn Hughes on Smoke on the water tribute; Dream On by Dio and Malmsteen on the Aerosmith tribute (THIS version is INSANELY good IMHO); Interesting version of Shot In The Dark with JSS on the Ozzy tribute too.

I have picked up a couple of interesting albums which recreate track-by-track songs of famous albums. The Moon Revisited rerecords Dark Side of the moon and to be fair, doesn't do a bad job of it. Re-Machined recreates Deep Purples' Machine Head and does it in such a way that is interesting and different. I really like some of the versions on here. I guess if you shop around you are bound to find something you might like!