I'm not on PM, but I have used gelatinized Maca periodically, for a couple of years.  I can subjectively report increased physical energy levels with its use.  I cannot positively attest to changes in butt shape due to its use, since my butt-shaping strategy is based on targeted weight training.  On the other hand, butt and hips is the only area on me where skin-fold caliper shows meaningful fat layer.  It could be genetics, or maybe there's something to the maca-butt connection.