I've had no trouble with maca, I just finished my first cycle with it. My chart was really good, and I had a perfect 14 day luteal phase (first time ever, it was around 12 days before). I'm on day 3 of AF, so no idea how long it will go yet. The only trouble was I had really bad cramps on day 1, but I think that's just because I actually ovulated well for a change and had a better lining. But I'm having cycle monitoring, and I know that the maca definitely helped my follicles develop properly, my estrogen was good and my temp shift was very clear. I haven't had any side effects, but I'm just on a fairly low dose, I split it across the day and I always take it after food.
Good luck!