As Steve said, it works -- you will grow for sure. It depends on dosage also. I took 6 caps a day for 4 weeks and put on 15 lbs, but if I do it again, I will take 9 caps/day for 6 weeks.
You can get a bottle of 1-AD for about $36 at massnutrition.com. So, a single cycle will cost about $200 (6 bottles).
I probably am nowhere close to my genetic limit, so I can still make gains, provided I eat a lot. 1-AD just gets me bigger faster, but I don't really need it.
So, for me, at this stage, it is not worth $$$$.