The "4 Kid Favorites: Ben 10 Alien Force" set is okay, especially if you don't have any of the first four volumes of the hit Cartoon Network series.
So yeah, it's basically the first four individual releases compiled together in one big set at a nice price I may add. Each disc has the same episodes chronicling the adventures of a teenage Ben Tennyson plus special features on the show itself and more. (To learn a bit more on these individual releases, check my reviews archive on these and more.)
So unless you already have these DVDs, you can get this set if you want to. Maybe consider this collection "Ben 10 Alien Force: The Complete First Season" or something. Either way, coming soon to Cartoon Network is a new series called "Ben 10 Omniverse". Surely that will be something worth seeing.