gn,
I had a McLeod unit and it leaked the first time at about 350 miles.
I pulled the trans and replaced the seals and it lasted till about 1200 mi.
This time an o-ring on one of the banjo joints let go.
I pulled the tranny again and converted to an external slave setup.
This required going to a larger M/C to get enough travel, which in turn resulted in a REALLY firm clutch pedal, but it works great. (And my left leg's getting stronger).
Stay with an external slave if possible.