I put the K-MAC kit in this week for my SRT, got the car alignment today the camber is much better at - 1.2 from -1.6, I was eating up my inner tire also had a lot of toe in at 2.81 and today at 0.33. Car drives straight, I will need to put some miles on it to see how the tires wear. This kit will give you some adjustments for camber but not caster, the K-MAC will do both with the lower arm bushings. I can not say witch is better but the upper arm change looks to be limited to camber only.
Removing the lower A arm bushings is a PITA with out the removal tool, and pressing in the new bushings requires a big press but then your done.