Only one I have tired was a SAN product called T100. I liked it when I used it last year. I think overall when I had dieted down, my look was a little harder and tighter. I took it for two weeks on, two off for 8 weeks total. It did make me hold some water and I did have an issue of breaking out on my back (Craig said it should not have done this). The water would go away once I was off them for about a week. I took 1 in the am, then 1 before my workouts. Didn't see a whole lot in my lifts going up.
This is the only one I am fimiliar with, so can't really help with the others.