What's this? People talking about PST, and I'm not involved?
This is blasphemy.
Anyway, as others have said, yes. Yes, though I recommend extensively patching it before you get into it. That's not to say that it isn't an amazing game in its vanilla form - it absolutely is - but the various patches/mods/restored content thingies really add a lot.
Regardless of whether you get the GoG version (probably the best way to go) or a physical copy, make sure you go
here and follow their instructions when installing and patching/modding/whatevering the game. I use all of the mods mentioned in that blog, and can definitely recommend each and every one of them (though I also recommend you turn the "scale of souls" option on, which they advise against for a
first run, but I guess that's debatable...).
It's a wee bit of work, but it's worth it to make one of the Best Games Ever even better, aye?