Someone around DA asked me how I did the Cyril Picture with my mouse. This brush was a big influence. It is my own creation (quite by mistake, it wasnt what i was looking for but better?), i use it quite frequently. And I dont mind sharing it.
I personally like it because it doesnt use the pen pressure for oppacity or blending or whatelse. Its really smooth.
I recommend you use it even if just once to render something! And, not necesary but, show me what you create with it!