Be advised that this is an unusual kind of 'greatest hits', in that the artist chose to re-record all his favorite tracks rather than simply compile them.
I'm giving this four stars for the insane genius of one track: "This One Jam", with Taylor Savvy on guitar, which manages to be entirely different from the original version (on "The Entertainist")and about a million times as cool, and that was already an infinitely cool track ("JIMMY CARTER!"). This is the version Gonzo and Feist did when they played Trash in London, and you can probably still see that over on YouTube so check it out. You'll be running back here to buy the album.
The other stand out track is the version of "Lovertits", featuring Feist. Gorgeous voice, fantastic arrangement-- sorry Peaches, this one's been stolen.
The rest of the album is frankly a bit FEH. A little like listening to the Beatles Anthology: it reminds you how great the originally-released versions were, and in some cases provides insight into WHY they were so great... but not compelling listening in and of itself.
The only reason not to buy these tracks at MP3s is the great liner notes that come with the disc, which the Gonzo enthusiast will love.
So buy it, but think of it as an expensive double-A side of two legendary tunes, and ignore the rest.