The C series Mamiya TLRs are built like tanks particularly the earlier ones, the last versions of the C330 were more plasticy though. I enjoyed using mine but for some of my work at the time the Mamiya 645s I replaced them with were more practical (I was using them commercially).

I prefer the weight of my Rolleiflex and Yashica, unobtrusive and easy to carry even in the extreme heat in Turkey.