i used it for more or less 8 months to 1 year, it was great, specially at the first months..i never had joint problems, in fact i used to have a lot and since i started Max - OT it stoped completely, but i did all the warm up sets by the book, and exactly as the protocol indicates you. Its really strange when you go already to the max on the first set and you dont feel any pain in the joints after all!!! (well, have in mind you already done like 5 warm up sets to this point)
My stenght went up a LOT, and it felt great to be on this program, but the size gains stoped after some time .You have to rotate your exercises a lot so your body doesnt get used to it, and you have to incorporate the weeks off as the protocol tell you...
my advice would be: use it, its great, but just for like 2 months at max (or like the 12 - 16 weeks they recomend you if im not mistaken). After that go to a normal program (or with normal to high set program). I think this way it can be great to use Max OT
one of the best thing is that you are done in like 30 min!!!