I use these both regularily - though in MF I have a rotation of several folders and now an Ansco Shur-Shot box as well.
In general, the 120 film experience is longer and more exacting than 35mm is for me - with 35mm I mostly just let the minilab scan to a CD. With 120, I get 'develop only' and if I'm lucky I get the negs back in plastic sleeves - if not, the whole film is rolled up in a cylinder. Then I struggle with vuescan-ning.
I've collected some samples in these flickr sets:
Ricoh Diacord - a set on Flickr Yashica Mat - a set on Flickr
Note however - I use these as
cameras rather than
demonstration instruments, and therefore the photographs may trade technical quality for something else.