I finished my 550 cycle(2 bottles) and am now taking 5 EPI pills a day and will use 3 bottles of it. I gained 3-4 lbs on 550 and got a decent amount stronger. Did not notice a whole lot in terms of body physique changes. I am almost done with week 1 of epi and I feel more changes on it then I did 550. I have lost 3 lbs on EPI and starting to lean up a good bit.