I ran this stack a few weeks back and loved it. I'm actually still on Formeron at 1 pump/day. I added Amentomax and it was great, but that definitely isn't necessary. Biggest change I noticed from Folli was the endurance. Some days I had to force myself to rest longer after my heavy sets because I was just ready to go. Strength was also up a bit, but I was not eating for strength/size. I played around with the Formeron a bit and went all the way up to 3 pumps/day for about 2 weeks. If you have an event coming up that you want to look shredded for, this is the way to go. The hardness and vascularity was crazy! Probably best I've looked in a long time (I stay around 8-10% bf year round). It's definitely a nice stack. I'd stay on it for 8 weeks though to get the best results