Got the 4 leaf pack done last week at the shop and have to say i am very pleased on how it drives. Little more stiffer than stock but can not tell any bottoming out at all. The receipt says 1,600+ for parts and labor counting 600+ for each leaf, 200+ for labor and U bolts.
As far as lift i can tell it lifted the rear a little but didn't get a chance to measure it before i took it down to them..
All in all, i like the leaf pack and enjoy how it handles and rides.. Also got my system put it and 5100's on the way as we speak.. It feels like a whole new truck!!