I've been using Barlowe's for a few months now. It's my first time using PM, but I really like it.
I can tell it's potent too because I only take one a night during the first half of my cycle and could spot if I go over a day or two. And, TMI, it makes me have tons more discharge during the rest of the cycle, so much to where I freak out thinking my period started... And, it made my already long cycle (30-32 or so days) to six weeks long!
The first couple cycles I didn't get much to any progress, but the third I definitely feel something kicking in, and my swelling lasted a lot longer.
I'm hoping to see real gains over the next few months.
Also, yes, the packaging is pretty discreet. But the bottle itself mentions PM's use for breast enlargement in small print on the side, so I still hide it. >_>