I would be disappointed by "the Complete Session". I wasn't! There is a lot more in the Complete Sessions than in the compiled version. Nothing boring! All good stuff, of the same quality as the compiled version - which is, by the way, is included in the album. My recommendation: If you are not yet an aficionado of Miles' "New Jazz", start by buying the compiled album. If you like it - how couldn't you - give it to a friend and buy the Complete Session!