Aside from the genius use of not having to send racy snaps off to the photo developer, the Polaroid was largely used in (amazingly enough) the professional studio photography realm back in the film days. Many professional cameras (such as the Mamiya RZ67) had interchangeable backs--one of which would hold medium format film (6x6, 6x7, etc) and another would be a Polaroid back. The polaroids would be used to check exposure, framing, etc, before the final shot was taken on "real" film. This was usually kind of a crapshoot however because of the poor performance of Polaroid film, but it was better than nothing. There are still some applications, for instance google for Joe McNally's "Faces of Ground Zero" project.
I don't have any polaroid backs any longer because I test with a digital SLR before committing to film, but I do still have a couple consumer Polaroid cameras; there's a primitive aesthetic to the system that's occasionally appealing. The film is unfortunately becoming very difficult to come by (being discontinued).
As for the reviewed printer itself--it seems a rather spectacular waste of money. There's no professional use for it, and if I wanted crap quality prints with the mates I'd run down to a photobooth.