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.
Beep
BEEP-O-L Black
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.