With the flexi-bellows, you will not need a bayonet mount for all but your shortest lenses -- say 35 and under. Lenses snap on with a twist, which is much more convenient than the Horseman, whose lenses have to be screwed on by four screws!
The movements are greared, and pretty smooth and accurate. But, as with any LF setup being used with a DB, I am not sure the tolorances are tight enough. This also goes for standardizing reference shots for the LCC tool.
I did not go with the Cambo because it lacks tilt. That is a necessity for my landscape applications. Cambo also seems a bit bulkier.