The JKS version has me intruigued as well. It has a lot of the parts I want to install already, and would probably buy from them anyway...Plus they are Michigan company, so I like keeping my dollars in state if possible.
I posed this question a while back. Didn't get much response, so I guess the JSPEC kit hasn't been out long enough. My only concern about the JKS kit would be the quality of the shocks. Not sure who makes them for JKS.
Having run the OME lift personally, I can tell you that it is a top shelf lift kit. I wouldn't hesitate to buy it again, it rides absolutely phenomenal.