I'm going to give it rave reviews but with a caveat.
I've been on Maca for 4 months and have gone from a total mess to almost ( almost) a completely normal human being. I'm perimenopausal, not in full menopause and I've been taking NOW bring Maca ( 1000mg once daily in the morning). The caveat is that peri is a roller coaster and there is a possibility that i'd be feeling better even without Maca, but it was definitely coincidental timing. And given that the three years!!! before going on the maca were absolute HELL I don't know if I believe the Maca isn't responsible.
I've gone from sleeping 3-4 hours a night to sleeping a solid 8 ( almost narcoleptic lol, but I'll take it). Hot flashes have diminished from continuous leading up to a period to an occasional full one, or several mild flutters almost only early in the morning. Ovulation is still pretty bad with the arrhythmia, but better.
But most importantly my energy level, and mood has changed completely for the better. I get a little PMS, but I haven't cried in 4 months and THAT is a small miracle. Anxiety and panic attacks about 95% better.
From the research I've done ( pubmed, journal articles) there seems to be a very low risk profile, no shown side effects HOWEVER the longest study I saw was for a year i think...maybe six months. So for all I know I'm killing my liver etc etc etc. I may regret taking it later, but for now ....totally worth it!!