First MF - Kodak folder, using 616 film. It was big enough to contact print (I was 11, and my dad helped me set up my first darkroom).
Second MF - Mamiya C330. I was working in a camera store while going to university, and while we sold Hassleblad's regularly, I certainly couldn't justify one of those. But when it was quiet, I kept gravitating to that big beautiful Mamiya demonstrator that just didn't seem to be getting the attention from the customers that I thought it deserved. Then my boss made me an offer ....
Still have the C330, and my dad thinks he has found the folder, and I intend to reclaim it.
A camera is just a tool and has to work to solve the problem at hand. For me, the luscious tonality of MF prints is the best reason to use them. For non-professional use, the portability and expense are important criteria- keeping in mind "is is appropriate to the kind of image I want to create?"
I've owned Bronica (S2a), Hassleblad, [B]Mamiya[I] 7 and Six (folder), Pentax 4.5x6 and 6x7, and Yashica 124G plys a bunch of folders. The Bronica was the best buy, the Mamiya 7 has the best optics, the Pentax 6x7 is most versatile, the folders are the most fun. And photography should be FUN!
When I travel, the Mamiya 7 with a 150 lens and the late model folding Mamiya Six are my constant companions. If it's a car trip, the Pentax 6x7 system and the Mamiya Six are the sole cameras along...
Whatever, choose what feels right for you and brings you pleasure to use.
Why Medium Format (MF)?
[font=Comic Sans MS][size=3]To some degree the choice of MF system might be considered in light of one's subject matter and budget. [/size][/font]
[font=Comic Sans MS][size=3]I got into MF shortly after my daughter was born and I sure enjoy the quality of the images. Furthermore, when shooting vast expanses and landscapes, the MF is one of the ideal formats.[/size][/font]
[font=Comic Sans MS][size=3]Details and high acutance are important to me most of the time so MF and 4x5 are important for my photography.[/size][/font]
[font=Comic Sans MS][size=3]If cost is an issue you might consider cameras other the "H.." system which is pretty pricy, I prefer Mamiya...but of course, the final decision rests with the photographer.[/size][/font]