Well, the study the supplement companies tout is a study on elderly folks, we are talking 70's.
In men it may have more propensity to convert to E, and in women to T. For women this may be good, but not for men.
DHEA is a precursor of test and est, and my research has lead me to the conclusion it will convert to whichever is currently highest in your system. Therefore if you have a high aromatazation level or just higher E levels, chances are it will just make it worse.
On the other hand, for women it can be very beneficial, especially post menapausal. Can help greatly to reduce hot flashes, etc.