You won't really know if it was a complete success until after you harvest and dry the buds. Gravity isn't really a product you can "see" doing it's thing. It only serves to harden the flowers.

My best friend used it for a few runs, and then took it out of his feeding regime. The complaints he had were lack of taste and smell when using the gravity vs. no gravity. It definitely makes the buds harder, thus a slightly larger yield per bud, but it didn't make for a larger harvest.

Be very wary of Gravity and Bushmaster. I have heard of people using single drops of either and achieving the desired results.