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. There is a wide range of subtitles (English, Czech, Danish, Finnish, Greek, Hebrew, Hindi, Hungarian, Icelandic, Norwegian, Polish, Swedish and Turkish for all 3, with other languages featuring on 1 or 2 discs), and Groundhog Day also has 5.1 soundtracks for French, German, Italian and Spanish.
As for the films themselves, all 3 are classics and represent some of the best work of Bill Murray and collaborators. Groundhog Day is probably his best work, about a weatherman who gets stuck living the same day again and again. Ghostbusters is very well known, extremely quotable and hilariously funny (much of which is due to on set improvisation). Stripes seems to be less well known (at least over here; maybe it is more well known in the States) and is slightly older, but is still very funny and watchable, although maybe not quite on the level of the first two. It does get very close however.
In all 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!