Basically, they allow me to have decent driveshaft angles without having to lower the transfer case. I also have a 1.25" JKS body lift so this also helps bring them back up.
Secondly this allow me to raise the engine without having to resort to poly mounts. It shakes a bit more at idle then I'd like. So I'll be switching back to rubber engine mounts.
What this will eventually do is allow me to raise the Tcase skid so it's flush with the frame rails and the angles should be about the same as stock but allow everything to be tucked up higher.