Has anyone tried using one of these on a mustang yet?

Sorry about the way delayed response. Basically it has a bleed valve that you turn in or out to control the rate of engagement. So you stage the car and when you launch you just slip your foot off the edge of the clutch or raise your foot off and the valve controls the engagement speed. Once you press the clutch the second time it disengages the control valve and the clutch works normally until you reset the valve for launch control again. I've seen it in use before on other cars. Works well once you get it sorted out.

I will be using clutch masters clutch delay valve once I do the SS Line and Clutch. A lot of import guys use this device to help save axles, shafts, and transmissions from exploding on hard launches. I didn't like the fact this used a solenoid to open/close so I went with the fully mechanical CM set up.