Thanks Leonore, I just never cared for holding a MF at eye level. It just never felt natural to me. I had a Porroflex finder for my 330 /220 and I always felt ridiculous holding a twin lens reflex at eye level so I never used it.
One of my Bronica's came with the AEII prizm finder and grip. I never got around to "fixing it" so I thought now's the time.
BTW, I don't know how familiar you are with Mamiya 330 gadgets, but one thing I had that was really nice was called a Paramender. It goes between your 330 and the tripod head to correct for Parallax. Nice little gadget for closeup photography. It's a precision geared rail that's exactly the height between your two lenses. You focus as normal with your viewing lens then crank up the Paramender and snap your picture. Your taking lens is now in the exact position of your viewing lens. Cool stuff for close up photography with a TLR