I haven’t been able to put any real miles on the new leaf springs yet, but I can say they so far do what they promise.
I removed my air bags and 1.5” blocks in the process. Ride height still increased by an inch, so I’m seeing 2.5” over all. Ride is much improved. It soaks up the pot holes a lot better and feels way more planted to the ground. I had what felt like wheel hop every time I hit a pot hole before. I keep a lot of crap in the truck, but not everything that's carried with me on a trip. Fridge and battery are always in the back, but I’m also betting my shell has grown pretty hefty in weight.
If I sit in the bed it drops roughly 3/4". I was about 180 last I checked, but no bets there.