I carried an SR40C for quite a while. Never had any problems with it myself. I really liked the way it felt in hand and it was plenty accurate. Had a couple of Glocks in that timeframe also and had no problems with them either. The Ruger definitely felt thinner for carry, but comparing them side by side there really wasn't much difference, I think a lot of it boils down to different grip ergos and the overall less blocky design of the Ruger. I don't know why there wouldn't be much demand for them, in my (admittedly limited) experience the SR pistols are perfectly fine weapons.

I've found that just about any holster for the sig p226 works for my limited pro, and the ones for the railed p226 works for my witness steel (with the big rail).

I've been using a Bianchi 19L (for the p226) as a simple hip holster for the limited pro and it fits almost like it was made for it. The only external difference between the match and the limited pro that matters in this case is the trigger guard (rounded on the match and square on the limited pro) and that shouldn't affect fit in the case of the Bianchi.