Fucking waste of money, IMO.
Not trying to defend Calmini here, but I disagree that their kit is a complete waste of money.
The instructions in my opinion are worth their weight in gold. They inform you on what you need to relocate, loosen off, and extend in order for everything to work right.
Plus for those people who don’t have access to a metal fab shop, this kit makes it possible for them to lift their truck.
Anyhow as to your question Weaver.
If it were me I would rather do a small suspension lift than jus a body lift. There have been a few write-ups in the past on how to create a 2" suspension lift for pretty cheap.
This way you will get greater flex out of your suspension system, and wont be loosing traction on every hump and hurdle.