Here's mine before and after.
BEFORE
(stock coils front and rear)
AFTER
(2" lowering coils from GMCPauls in rear)
I've had the springs on for a couple of months now. The truck's attitude is a lot better IMO and they softened up the ride in the rear. After lowering, I had a minor clearance problem with the passenger side exhaust pipe and the upper panhard bar bracket. The bracket dented the pipe a tad. I found as long as I don't bounce the truck violently, I'm OK. I rarely load anything in back, so no problem there.