Using a anti arom like Letro I think is a wise practice in general. It will keep most of the bloat in check and keep estrogen levels low. I have done cycles with nolv, Letro, Arim or with nothing and in the end, my net LBM changes come out the same at contest time. You definately won't be as strong or full looking, but you also won't get the mind **** of loosing 10-15 lbs between cycles. Extra water gain from excess estrogen is not good. Not because of the extra water but because the water is a signal that you have an abnormally high amount of estrogen floating around in your system and that isn't good for staying lean, big and strong. You need some E but not a lot.