I like my Ingalls rear camber kit but I have experienced 1 negative thing about it. After 2 years use my camber became very negative. I didn't realize it until I went to rotate my tires and saw that the inside edges had worn down to the threads.
I took my car for a new set of tires and realignment when it was pointed out that the Ingalls kit was the cause. The rubber inserts had collapsed so much that they were squeezing out, almost out of the arms. I ordered new kits and had the car re-aligned. Every year I have to have the camber adjusted to be neutral to account for this. I wish they used harder rubber or urethane inserts. That would definitely reduce the issue and increase the longevity of the arms.
I did consider going with the single-piece top mount adjustable arms but they do not have toe adjustment, just camber and I have a slight toe issue.
Ingalls re-designed their bushings to combat this problem. Heeltoe released a statement about it on their website.
Also - if you use only the upper arm for camber your stock toe can still be adjusted via the stock cam nuts. I have an upper kit and Ingalls lower camber/toe arms and the adjustments are almost unlimited.