I just picked one of these up off eBay. Just the 645, 75mm 2,8 lens, and 120 insert. Probably "overpaid" for it, but oh well. I don't see many folks using this beastie here - is it a great camera? A pretty good camera? Anything I should watch out for, like, common problems this model has or tends to develop? Thanks in advance. I have several rolls of Ilford Pan F and Fuji Reala to shoot!