I always use a soft touch release when I shoot with digital or film Leica's. I like the feel and I find that slower shutter speeds are possible.
The BEEP is going to be attached to my Leica M10. Match Technical makes various sizes and styles of soft touch releases. The BEEP O model has a convex top that has a matt finish. The BOOP O has a concave top. They also come in threads that are long or short. The O in the name is for the O-ring that is attached just below the top. The O-ring compresses when you attach it to give a nice tight, secure fit.
O-S: with short thread for Leica M-E, M9 Monochrom, M240, M246, M262
O-L: with long thread for the Leica M3, M4, M6, M7, M8, M9, M10
I really like the look and feel of the Beep. It has a nice soft touch and makes for a smooth release. They have other gizmos for Leica's that I should look in to. Highly Recomended.