I used these in studio in the early 80's and loved them. The movements all "felt" very natural, and there was not a lot of jumping back and forth to compensate for the effects of movement interactions. It might be a little big for field use, although with a shorter rail, it might fold down compactly enough for you. Not sure if the LE is the version with removable bellows, but if it is, the whole thing folds pretty flat for transport, but not as compact as a field camera. Build quality is excellent. There are extension rails, bag bellows, and longer bellows available. I've used Sinars a couple of times, but am not competent enough with them (especially the Sinar movement system) to give a fair comparison.
If I were looking for a monorail camera, I'd go for the Horseman in a heartbeat.
Lee