So normal 4x5 lenses won't cut it? I have pretty new schneider & nikkor lenses?
Fraid not. I use Schneider Digitar lenses which have incredibly sharp resolution but with a far far smaller image circle than "real" 5x4 lenses. It's fairly logical I suppose when you consider that depending on the size of chip you choose it will most likey be sized somewhere between 35mm film and 6x4.5 but rival or surpass 5x4 in terms of output size.
On the usage side of things, am interested in how the back is triggered and whether that causes much hinderence in the field. I have only seen one picture where a cable was visible from the flash sync on one brand.
Some cameras have full electronic feeds built in to connect the back, shutter and diaphram so there would be no external wires to see. You can even have remote wireless trigger with full control over all aspects of the capture, apeture and shutter speed. Personally I dont really go for all that and connect with a lead that goes from the flash sync connection on the lens to the back to trigger it with the shutter.
If landsape is your thing then while these kits work well out in the field, to me it just feels all wrong. I had the need to try it on a landscape shoot and remember standing on a cliff top with a few 5x4 users enjoying the last light of the day and as everyone else loaded a sheet of film, I switched on the Valeo. The sound of the cooling fan humming away was just to alien in that environment for me and felt totally out of place.
The results were great and I even had the camera on the beach shooting the tide rising into some rockpools with the waves lapping at the feet of the tripod and can only praise the quality and reliabilty of the unthethered system........
.... BUT, while it's great for commercial work, I'll be staying with film whenever the process of making the shot means as much to me as the results I get.