Another Malkoff fan here. I have the M61HOT MD2 with high/low head and one of Don McLeish's Ti pocket clips custom installed by Barry Milton. The light will take other clips meant for 6P size bodies, but too much of the tailcap hangs out of the pocket for my liking, and the much deeper ride of the McGizmo clip is preferable for me.
The MD2 switches from high to low by loosening the bezel one quarter turn. Genius. No longer do you have to worry about what mode the light is going to come on in. Leave it in high and it always comes on in high—and only high—when the tailcap switch is activated. Doing ninja stuff and want low mode to avoid giving away your position? No need to flash the light from high to low with the tailcap, just twist the bezel and the light goes directly to low mode.