Ive installed the PMF front mount and 2011 rear springs on my truck and it is definitly a very good improvement. My truck runs some weight in the bed so I couldnt compare to an empty truck though.
The springs are alot better on small to medium bumps but they rebound hard off of larger bumps. There is also more axle wrap on the 2011s versus 2002 springs with a 4 inch block.
Currently im running the 2011 leafs with Carli add a packs. I had to remove what appeared to be two lower leaf spacers to get my truck to sit where I want it in the process of the install. With the add a packs the smaller bumps are less noticeable and the big bumps dont result in as aggressive of a rebound kick.
The shocks are Rancho adjustables I had laying around. They were installed because the Bilstiens I had on the truck would not stop the back end from wallowing like a boat with the 2011 springs.