As others have said. The biggest gains will come from proper diet and effective movements.
But, with that being said, I take it daily and have for years. The last time I quit I noticed I got tired a lot quicker during my workouts. It never made my bench go up. But it did let me bang out more reps at a higher weight, which did make all my lifts go up. The weight gain is minimal in my opinion.
And really as long as you get a good quality product, save your money and just get a big tub of monohydrate. All the other deliveries have not really made that big of a difference. Check out pubmed before taking though.
http://www.ncbi.nlm.nih.gov/sites/en...pmc&cmd=search