"Suicide aromatase inhibitors, such as ATD or aromasin, will permanently bind to the aromatase enzyme, this prevents estrogen rebound after you discontinue the AI. Other aromatase inhibitors, such as letrozole and arimidex do not have this ability, so there is a chance of estrogen levels rising after use is discontinued."
^found this somewhere...is this true? As in, since im using it DURING my cycle, i can just do my normal PCT routine (Nolva Clomid DAA), WITHOUT ATD (only plan on using it ON cycle) and not have to worry about the dreaded estro rebound afterwards???