I have a McClellan saddle that dates back to the mid 1860s, from what I have been able to find from several reliable sources. The leather was pretty bad in places and had stitching coming loose at seams. It was not an actual military saddle, but a commercial copy, so it had little actual historical or collector value (they were a dime-a-dozen, so to speak). I stripped it down and am in the process of reinforcing the tree and intend to restore it to as close to original as I can.
I like the way your saddles look and like the way the accouterments fit to it (snaps on the saddle bags, etc). Looks very convenient and light for a long trip. I wonder whether they are better on the horse's back than a western saddle for a long ride. Good question for another thread, I suppose.
As with any saddle, we started small and worked up - our last trip was five days with between 6 and 11 hours in the saddle (which includes the time we were walking too...). We haven´t had any worries with their backs or girths, and although their comfort for the rider is minimal, we don´t have any problems with them either.
If we hadn´t gone with those ones, we´d probably have gone with another French saddler, Guichard (plenty of stuff on his site if you google it) or with one of the trooper saddle-makers. But because we´re in Europe, it was finally easier to go with the former because we could see them.
Sorry for the thread hijack!