this will set you higher than being leveled. its a decent kit and would do well for mild off roading or street driving. depending on how they have it valved, you may not feel much difference in ride as the new trucks ride really well. The way i have mine valved, you can tell its on coilovers between same body style trucks. unless you hit something big like a pot hole, curb, decent rock, etc, thats when you really know. The sway bar and valving are what really make or break the ride.
if you do do the front, you will notice the rear feels like it rides harsher. now that you soften up the front, the rear isnt forced to work as much as the front. but again, this comes down to shock valving and how stiff that rear spring pack is.
pull the sway bar end links off and tie the bar up out of the way and see how you like the ride. its not going to corner on rails but the ride should improve. it would be a decent comparison of the coilovers with sway bar on and light valving stack. (light in comparison to the truck lol, it will be a heavy stack compared to what most off road guys see in these shocks. you can always change the shock valving if you dont like it)