I got into E really heavy a few years back. I would pop 1-2 pills a night for days straight, and always take it on Fridays and Saturdays.
I wouldn't recommend anyone to do it. Or even take it once for that matter.
I'm pretty fucked up from the whole thing, I still randomly get flashbacks. The reason I stopped is for some reason, I just kinda flipped out on it one night.
I was over at one of my good friends houses rollin pretty fuckin hard. I just started freaking out. I thought for some reason they were gonna kick my ass so I left. When I got outside I kept thinking people were chasing me and shit. Long story short, I ended up sitting in my car alone parked out on a country road for like 9 hours with a coat over my head completely freaked out.
That scared the living shit out of me and I haven't taken it since.

X