I have the wixey installed on my Mast-R-Lift II. It works great. The installation instructions are fairly clear. The biggest difficulty is getting the mount to be exactly perpendicular to the base plate of the lift. Once properly installed, it has kept it's accuracy pretty well, I check it about once a month and it is always very close in agreement with the wixey mini digital height gauge (2 to 3 mils).
By the way, the JessEm dial is not that accurate. It's not clear why but if it you take a measurement and then raise the lift by, say, 4 turns which should be 1/4", the wixey gauge and the mini digital gauge will agree but it's not 1/4". I tested this a while ago and don't remember the amount it was off by but it was significant. Could be backlash.