I just installed it and took it to the track.
The brake takes some getting used to but the Z does everything they say. It feathers the clutch in the turns precisely. If you are in too high of a gear, it corrects it for you by clutching perfectly. I fell pretty hard once and lost my grip on the bars. The bike kept running, I picked it up, got on and took off without missing a beat (it was still in gear). Right hand turns are awesome. Break slide with the left and lever and get on the gas. Too high of a gear coming out of a turn to a jump? No problem. You need to brake off of a jump? No need to grab the clutch, just tap your foot brake.
Great job Rekluse! I know I improved my lap times the first day.