I use adex because i get it prescribed, but in the future im going to be using aromasin (exemastane) because it does not have the same negative effect on cholesterol levels. When using adex you need to take the minimum amount needed, too much will crash your estrogen levels and you will have the side effects some of the guys mentioned. Also your blood can start to thicken, which is really bad. .5mg every other day of Adex or 3 times a week should be plenty for most cycles.
Have used Letro when i have had gyno, its by far the strongest, but should only be used if you really need it.