Best: Factory Service Manual, ACOS, Trans.Cooler, APN Header, 4.56's, No-Slip Rear, Aussie, Steelies, JKS LCA mini-skids, JCR Tie rod and everything that is adjustable!
Worst: Rigid Rock Rails (Terry is a good fella though), poly spacers, Rusty's AAL, RE twin-tube shocks, ditching my air box, removing the hood liner, Teraflex QD's, anything not adjustable.