18DAI,Ken Null is a household name in this area. I met Ken when I worked at the Gordon Co.SO. I only have one of his holsters,an SMZ. I use a Rosen UPL for my 3913 as I llked the one I bought for my G26. Reading your review prompts me to go ahead and get an SSS for it ,also.
One thing I know that you're right about is the fact that Ken Null is a class act. Any long time gunner will also agree,as Ken is one of the greats and has been around awhile.
Good review and recommendation.