Quality of Product when I used to sell them, the list was basically broken down like this:
SuperLift
SkyJacker
Tuff Country/Rough Country(Quality was on Par with each other, but I can't remember if they were more or less the same Company... They usually offered a Good Bang for your Buck Kits, when it comes to affordability wise)
Rancho/Trailmaster(Both used to be up there towards the top with their Quality, but slipped due to poor shocks, and other accessory quality)....
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Fab Tech and Pro Comp always looked like Poor Quality in some cases Foreign Made junk that most of my Customers steered clear of, or I heard nothing but complaints when a Customer did have an item from them......
There are of course Newer companies out there, but I haven't had any experience with them, selling or personal wise...