I have several, currently using Bianchi Professional and it is OK. I really like the sweat shield between the gun and your skin but I have decided that any holster with a clip is probably not the best idea.
The difficulty with each of the above is the clip overlying the cylinder, the fattest part of the gun. Better for the clip to be offset. This enhances both concealment and comfort.
Matt Del Fatti will do this on special request (he calls it the "DD" model), as wil Eric Larsen at HBE.
I used a Galco Scout for mine. It has a J-hook that goes under the belt and it can't come off with a fast draw. I know because I practiced and practice some more with it. Here's a link to it. They show a automatic in it but at the top of the page it says it's for the SP-101 too. Work good for me. Good luck. http://www.usgalco.com/HolsterG3.asp?ProductID=912&GunID=171