Only problem I have with half-frames is how long it takes to use the film.
Damn! What a glorious set! I used a Demi the other day, and was just amazed how bright the viewfinder was! As for waiting to use all the film, I find a spring-drive helps, as you can shoot a series as fast as you can click the shutter.
I love my Ricoh Auto Halfs:
Peter, if you ever feel like just taking some photographs of your hardware, and post them over in the <Articles> section, feel free! You've got some really nice kit there Sir. Skj.