You get what you pay for with Rusty's stuff. His track bars are horrible. The stocker is beefier. I had bought a full 4.5 kit with new rear packs. I had some problems with fitment and DW following installation. Rusty was less than helpful to he honest. Within 4 months, most of the parts had been swapped out for one problem or another. The only part left from that kit on my truck is the main-leaf of the rear springs. Everything else is gone, thank goodness. I do have to say I didn't have much problem with the coils and ran them for a couple years until I redid the whole suspension and needed a different height spring. Rears sagged and had to be mutted with additional leaves.
Having watched similar threads since I had my troubles, it seems that many people have the same issues. Those that reccommend the kit typically have only just put it on and have little to compare it to. Rarely do you find someone that has run it for a long time without having problems.
If I could turn the clock back and make my decisions all over again, I would have gone with the Rubicon kit. It really isn't that much more money, but the quality is far superior. Unfortunately, beginner wheelers generally make decisions based on cost alone (as did I at one time), so Rusty remains in business.
To all of you with Rusty's equipment who would like to flame me, that is your choice. I am glad his stuff is working for you and I hope for your sake, it performs well in the future. But Rusty will not see another penny from me.