I actually just purchased the 2" Heavy load Old Man Emu lift kit. It hasn't arrived yet, so i can't give you my review.
It's acclaimed that the OME suspension lift improves the ride/handling over the stock setup. I can only guess that other lifts don't improve the ride/handling as much, if at all.
I've heard the actual life can be anywhere from 1.75" to almost 3", depending on your load.
I choose this kit because my Jeep is my only vehicle (daily driver), and I didn't want to go overboard.
I'll try to re-post after I've experienced the finished product.