I took X-Factor when I was 17 and had AWESOME results!!!!!
Lol I'm being sarcastic because although I did take it..I also was 15 or 16...ran my first real bulk where I took advanced lifters advice and ate a SHIT LOAD...literally. 7-8 meals a day, got on a solid lifting regimen hitting it 5-6 days a week. I was also at a Military Academy so I had a perfect sleep cycle, and plenty of PT.
So...it depends how you look at it bro...but I did put on 20lbs...and I did take x-factor...but my lifting partner had the same results without x-factor.