It's Planescape, not Planetscape, you heretic
And yes, the game is of the one best RPGs of its kind and games altogether, but be prepared to be hit with insane
amount of text and the fact, that you might not even see the real ending on your first try. It's also long and sometimes unforgiving.
I still have the original 4CD version in box lying around and a 2CD version, that was released with one magazine over here.