I’m only a week in to taking PR-XT stacked with ProPF3 and wow!!! The pumps are pretty insane, especially on shoulder day, but Im not fatigued at all. In fact I feel like I’ve got a little extra in the tank to push through a few extra reps. The other thing I’ve noticed is a major reduction in DOMS and recovery time. I usually use that soreness to try to talk myself out of hitting the gym by Thursday but not right now. This combo is awesome!