I think the KW sleeve kit is a little scary. KW uses a VERY small bump stop that is not appreciably stiffer than the large ones the car comes with. If you lower the car a lot, it has the potential to compress your expensive EDC shocks to the point of damage.
I don't think the sleeve kit is poorly built, I just think the design leaves something to be desired. I like the Ground Control and TC Kline design, they get the required additional travel from camber plates... (although I'm not really recommending the GC camber plates due to the issues they've been having.)
The KW sleeve kit can be set VERY low, and as a shop, I'd be worried about the liability of $3000 worth of EDC shops on a $899 sleeve kit.