I first had someone install the Superlift. It was about 8 months later when I added the rear 2" spacers, then I got the bilsteins and leveling plate for the front. I put all that on myself. So to be clear, the only additional parts to the SL are rear 2" pucks, front 1/2" strut spacer plate and bilstein struts.
As far as extra wear, since the SL maintains stock geometry, I'm only out of line by 2" in the rear and 1" in the front. I'm not having any issues at all. The tires are not showing any irregular wear and all driveline/suspension components are smooth and quiet. Since I knew I was going to have such a high center of gravity I upgraded both my front and rear sway bars to stiffer SRT sway bars. It handles MUCH better on-road with them as body roll is reduced. I disconnect them if I do anything crazy offroad.
Due to the offset of my rims I'm not running spacers. Due to the larger tires, the pinch weld mod is a must in the front. Since the SL has longer cast iron steering knuckles, the bolt did not have to be trimmed. I also had to trim out about 8" of the fender liner on the front side. I'll post up a pic of that for ya later today.
'05 WK LTD HEMI|...TOTALED
'08 WK HEMI|Mopar CAI|Superchips Flashpaq|SRT8 Front and rear sways|...lots more on the way