Subjectively: initially bought macboost shims in hope of easy installation and quick solution for tires premature wearing. So installation- pain in ass. Who designed those arc ?! Eventually I cut shims in two washers and asked extra hands. Installation is not for one person and not dyi friendly.
Also my rear right worn out much quicker then left, i guess camber degree is not equal between right and left, and thus shims will keep delta in degree difference at the same kevel.
N2itive sx-p2. Afraid to think even to install them as dyi. But idea to make things right overcome me. Bought them.
Quality impressive, service too. Installation is much easier - second arm by me only. Feeling after installing n2itive and shims is not the same, completely not not the same
)
my take, if you wanna right, comprehensive fix - it must be adjustable arms.