Estrogens And Bodybuilding

Hi
I d like to know you guys have experience with estrogens in your cycles. A few guys around here use it (estradiol 2,5mg per week in one simple dose) intramuscularly and they say it works. It should clear receptors when used alone and improve the effect of the AAS when used in combination with em.
Im not sure whether this could be good, but I see that it really works but dont know what negative effects it could have in a male body.
I didnt read anywhere about the use of estradiol...

Do you have experience with it or could you tell me at least theoretically how this can work? Thanx

Victoria's Secret is having a sale on Bra's....

yes, it may cause serious gyno and quite strong water retention, one of them has a nice gyno :-) this would not be a problem to me bro

I just want to know a scientific mechanism how it may work...