I installed, and have run a McLeod hydraulic T/O for over two years with no problems
PRO:
Simplicity
No clearance issues
Great Pedal Feel
CON:
If any of the numerous quad rings or o rings decide to leak, the only way to repair is by total removal. Plus, any catastrophic leaks usually result in a destroyed disc.
In older McLeod units, the double o-ring M/C and bleed line fittings were apparently prone to leakage. McLeod now uses an improved design, and it looks pretty foolproof. Though I never had any problems with mine, I did have my unit updated by McLeod with the new fittings.
When you install an hydraulic T/O, it is critical that it is set up correctly. Correct clutch finger to thrust bearing gap is critical, and it it always advisable to set up a proper pedal stop. Use of DOT 3 is also mandatory, as other types of fluid may deteriorate the seals.
Hope this helps.
Bud