I used a Bianchi carry-loc (Avenger) in a plainclothes/surveillance assignment. I loved it.
Got into one real knock-down drag-out fight involving two cops, one skell and a Good Samaritan, and the retention worked like a charm. Qualified with it from concealment and had zero troubles. And the body fluids washed off well. The downside was the snaps on the belt loops: if ever unsnapped, they require tools to snap. Treat them as permanent belt loops and you'll be fine.
It's a great holster.
"To spit on your hands and lower the pike; to stand fast over the body of Leonidas the King; to be rear guard at Kunu-Ri; to stand and be still to the Birkenhead Drill; these are not rational acts. They are often merely necessary." Pournelle