OK for people doing supramaximal loads like rack pulls, quarter squats, partial shrugs, etc. I t hink you are only supposed to do like 5-6 reps MAX. A "set" should be no more than 2 or 3 reps. You'll get a lot out of it, but not if you injure yourself trying to do 40 reps or even 10.
Note I'm not a trainer or anything, but this is what I have gleaned over the years
Also note, this only applies to natural lifters. Those who are taking celltech are on another planet