My overall impression of having had a JK in my garage for a couple days is that it's way harder to work on than my TJ is. You can't even just bolt rocker guards up to the rockers, you have to contend with setting threaded inserts into the tub's outer skin (it has two layers) and hope you got them positioned correctly. When I went to look for the engine, I couldn't find it... it was apparently hidden behind/under large plastic things that had to be unbolted first in order to get to the engine.
The headlights don't operate via easy to work on conventional wiring & switch type circuits, there's a computer data bus that operates them. What? On a Jeep?
When I drove the lady's JK to the store & back to pick up something for it, it felt like I was driving a family fan. Its 3.8L V6 reminded me of driving an old underpowered family van. The whole experience was very un-Jeep like.
Maybe I'm just too old but I'll stick with my butt-simple to work on TJ.