I may be in the minority here but I think it is used way too often. It's used for lowering prolactin but, in my opinion, that isn't the problem for people at risk of gyno (be that test gyno or deca/fina gyno). In order for breast tissue to differentiate and develop, more than one hormone has to be present (estrogen, progesterone, prolactin, and I think IGF-1). The normal therapies for gyno (aromatase inhibitors or nolva) will do the same job of preventing gyno since if there is no estrogen, gyno won't develop. It doesn't matter how much prolactin is around. Taking a more harsh drug (bromo) just isn't warrented IMO.
Also, there is the issue of bromo (and all other ergo alkyloids) mediating dopamine levels. I know that many here, including myself, take SSRI's. Some SSRI's (wellbutrin in particular) also work by increasing dopamine levels (among other things). It seems to me that it might be dangerous to mix different drugs that both affect dopamine levels. That affect could be additive or even synergstic. The best case scenereo would be an antagonistic affect but that would decrease the affectiveness of both drugs compared to either one alone and I certainly wouldn't want to decrease the effectiveness of my SSRI.