Hey Frank, i still shoot polaroids with my RZ from time to time. Remember that you will be getting a 6x6 image, not a 6x7 (and the back doesnt revolve). I read about someone modifying his back so he got a larger exposed area but i havent done it to mine.
It's quite a lot of fun to shoot but not for proofs. I use a DSLR for that because its too expensive with Fuji's film
Now im looking for an old Mamiya 600 SE camera. Shot with one in Malmö not too long ago and fell in love with it =9
(and yes, i still shoot both digital MF and DSLR's, but film is just fun