It is a con in the sense that the box says this an upgraded version of the game that will work on Vista without fiddling around (it won't) and it isn't, but that's the publisher's fault, not the fault of the game itself.
To get it working, google and download the official Planescape: Torment v1.1 patch. Try different options in the option menu. Turning on software transparency and software mirroring can be useful.
Also consult this mod page as they have lots of useful advice and help on getting the game to work: