I ran two consecutive bottles of Rebirth, stacked with one of my last precious bottles of Formeron. My dosing format was a capsule of Rebirth and one pump of Formeron AM (post-shower), and one additional capsule of Rebirth PM. The only other supplement I took throughout this run was a preworkout.
I ran this stack during a pretty stressful time - got laid off, subsequent job hunt, getting back into college, some family issues, ect - and stress is something that typically destroys my libido. I tend to over think and constantly examine difficulties from every conceivable angle, and can't get in the mood, let alone focus if I do. Point being, after about a week of Rebirth and Formeron, my libido was INSANE. As an example, I officiated a wedding for a close family member and was scared $hitless that I'd screw it up. Well, throughout that day, my lady and I got it on on the way there, outside after the wedding (evening), off the highway on the way back, parked in my front yard, and throughout the night into the next morning.
I also experienced pronounced drying effects from the AI, of course, as well as augmented recovery, and a general sense of well-being in a trying time. Forgive me for going off on the libido aspect of Rebirth, but yow. So, to answer your question in as long-winded trends as possible, yes, I used Rebirth in a natty stack, yes, I was -very- pleased with my results, and yes, I would run again.