I think it probably depends on the manufacturer and the quality of the original suspension components.
I was lucky enough to pick up one of the last Patrol 4.2 Coil Cabs. Drove around in it for the first 5000k and thought all was good. It was a tray truck for heavens sake, built to carry loads. We then decided to go across the Plenty to check it out, have another look around Alice, and then home across the Oodnadatta Track. Being rather thick, it was a day before we going to leave that I lobbed the Kimberley onto the back for the first time. Jeeeezzus, was the reaction. The tray of the Patrol sank most of the way to the diffs.
A very frantic call to the local mechanic had the truck on the 4 poster getting Old Man Emu installed the same day. When I saw the difference between the original gear and the OME stuff it was amazing. The Nissan shockers looked like they belonged on a small car, and the springs were a lot thinner than the new ones.
As on my GQ, the OME suspension is going along really well I am sure the Plenty would have killed the original setup.
As to the height increase, I think it is just a personal issue.