This boxset contains the 3 special editions of these films, so they have all the special features of the separate discs, including documentaries and commentaries.
It consists of 1 DVD case, with the 3 discs sitting on the sides, and an identical slipcase.
As for the films themselves, all 3 are classics and represent some of the best work of Bill Murray and collaborators.
I would say this is worth buying if you don't have any of the films already, as it is cheaper than buying them separately. Enjoy!