Been using this script for ~2 hours so far and it's working great and seems to be stable. Rough average of 30k xp/h at 70 range, should be higher i feel.
Only problem i have with it is that it isn't very good at spamming the target at the right time to make the screen go away instantly. This means that it has to mouse over to the X and back, which does decrease xp/h, and in my opinion makes it less stealth. (Suppose you know more about this than i do though)
Other than this i'm very pleased with the purchase so far!
Also, any recommendations as to how much you can use this daily without the fear of the ban-hammer? Personal guess would be 3-4 hours.
Edit: I've been fiddling around with trying to allign the X and the target in order for it to just spam away, seems to be going good but does occasionally fuck it up because the character has to walk to the Instructor. If some sort of screen allignment was implented this would definitely be 10/10.