I tried Pentabol Extreme for about two weeks and strength was noticeable. My muscles were actually fuller also, but it made me hold a little water and I am on a cutting cycle. I will use it during my next bulk phase. I think there is something to the oral activity of this product because for the most part I have always thought prohormones were junk. If you look at the research they are definetly powerful substances but there is always the question of Oral bioavailability and I think the Ethers solve that. I also, beleive that different esters out there also, make the prohormone orally active, as does an Ether due to making the compound fat soluble. It is still early and again I was only on it two weeks but I did get stronger and fuller on a lower calorie diet due to my cutting phase, so I want to hear more from real users not people who just read advertisments and argue for the sake of arguing.