I have a c220 and although I enjoy waist-level viewing, but sometimes I want eye-level viewing for handheld candids. I was thinking of getting a grip and prism or just getting a 645 SLR. Medium format RF's are ideal but too expensive. I know that these are two completely different cameras/systems, so i was wondering if anyone can share their experiences and offer some advice. I shoot in available light and with a handheld meter so I don't need auto-focus, auto-exposure, or TTL Flash capabilities and I can live with the limitations of a TLR (parralax, no backs, etc), but I'm mainly concerned with the quality of the viewfinder and ergonomics. More specifically, 1) Is a C220/C330+Grip+Prism awkward to use handheld? 2) Are the 645 screens/prisms noticeably superior? Are they inverted? I'm undecided between Pentax and Mamiya. 3) Is shooting horizontal orientation with a 645 camera a pain? I prefer square, then horizontal. I've never handled a 645 so I'm not sure how they feel.