eric, i am planning to use the X-ActII for people shooting as well as fun/private landscape stuff and maybe some architectural...like i said i used to shoot with the 680 handheld using movements and that was a wild affair...sweaty and with mostly unpredictable results...but definitley worth it...shooting with the 55 on the rollei would be similar, but i find the movements a little limiting (especially for stitching) and because of the digital crop it is really hard to focus when the movements are in place....so i think if i am tripod bound anyway, might as well go with the X-Act...it uses all 6000 lenses, backs, finders along with all 4x5 lenses...because i have the P20, there is plenty of coverage left on my lenses for movements and obviously the digitars would give me even more room....
the other reason to go with the X-Act is to let me use my longer lenses with it....it will probably be a while before i get one, but i will keep you updated...