I may have posted this before, but the short coming of all retrofit clamp kits is they attach to the anti-roll bar inboard of the stock location. Ideally, a bar is designed to twist (like a torsion bar) not bend like a spring. By not supporting the outer most points, more of the force from the wheel will translate to bending rather than twisting.
My solution after using my own clamps for awhile was to fabricate some very simple brackets and have them welded to the subframe (I have have access to a welder, but I would guess most independent exhaust shops would do this quickly for a low cost). The brackets were 1/8" wall 1"x1" square tube (You can buy this at Fastenal.com in increments of 1") with two mount holes drilled through them. These are welded in the stock location with the top hole aligned with the hole in the subframe.
I then ground down flange nuts (so they fit, but can't spin) and slid them up inside the square tube. This has the added advantage over stock in that if the bolts ever rust, you can just cut them and the nut will drop out.
I've done a bit of custom suspension tuning over the years and have a pretty sensitive seat-of-my-pants. The difference was appreciable vs. clamps.