It's very good. I was just about to post about this before I even saw this tread. I have been using their tren ace for maybe 10 or so days now and even when using a very low dosage, it can already feel all of its effects kicking in. I've already gained considerable strength too...just did my 2nd round of workouts and every lift went up. My incline presses went up more in one week than they ever have. Now, keep in mind that I haven't done incline presses for over 6 months ( as I was doing hammer strength inclines for a while instead), but after doing 315 X 8 last week, I ended up getting 315 X 15 yesterday...just one week later. Yes, this is all regain, as I had previously done 20+ reps with 315 in the past, but to gain 7 reps in a single week...that never happens...not for me, at least. I was actually shocked. It is probably the single largest rep increase in have ever experienced in one week on any exercise. I have no doubt that I will be up to 20 reps within 2 more weeks. If so, going from 8 reps to 20 reps in 3 workouts is a super fast regain.