I took BO for 2 years and the mental changes were very noticeable for me over time. It didn't happen right away, and it's very difficult for me to describe, the best description for me is that it gave me a calmness.
A little over a year ago I switched to HRT and mentally nothing changed, I had to stop HRT a couple months ago because of some liver function issues butter effects of BO have not subsided, with the exception I have my libido back, BO knocked it back, HRT took it completely away
Overall I am very pleased with BO, I switched to HRT because I wanted physical change that was too slow on BO.