Have just completed 8 weeks (two packs) of this stack, great size , strength and definition gains. Strength increase from the beginning of week two, size progressively increased from the end of week two right through to week 8. Had loads of positive comments from those who do train and those who don't. No back pumps or bloating, no estro issues at all which can be a problem for me. I did have some dry burn pain at the end of very heavy sets. Up your fluid intake as I found I needed to so as to keep things flushed out. All in all I highly recommend this stack at any time but especially at the beginning of and through summer.