aromasin is my favorite by far. followed in a not so close 2nd is femera. depending on how much aas your taking is how you'd dose it... its been a while since i've used it with a cycle so i can't say exactly how much i was using.
but 25mg of aromasin is a "dose" i never used a full 25mg/day unless i was fighting gyno symptoms from dbol which hit me really hard.
Nelson is incorrect in my opinion. When I used proviron as an anti-e, it didn't do shit for me. I got some pretty sore nips which I had to immediatly start treating with nolva. I mostly use proviron for pct now.