I'm a junkyard lift guy. I have V8 ZJ springs in the front of mine (gained an inch), and also 2" spacers. I have rear Crown Vic springs in the back of mine, with the coil isolators that came from the front. I'm sitting at a 3" of lift, and it works very well, and rides very well. For shocks, I'm using stock JK shocks.
For spring fitment, the ZJ coils are a perfect fit, but the Crown Vic springs need a tiny bit of the coil cut to slide over the bottom (I think...) perch. For the shocks, I made my own bar pin eliminators for the front, and the rear are just about a bolt in. The lower part of the shock is a tad wider than where it goes into on the Jeep, so it needs a touch ground off.
I'm extremely happy with how it works, and since I have no plans of going higher, I can't see myself removing it to replace it with a "proper" setup. I've been in three other TJ's, stock, 4" Skyjacker and 3" RC, and mine rides WAY better than both lifted ones, and equal or better than the stock one.