I wouldn't use J&K if I had to do it over again ..
Shortly after J&K installed my countertop Lowes came out to install my my cooktop. A small hairline crack formed in front of the cooktop. Lowes came out to look at it and it appeared to them that someone had attempted to repair the crack (implicating J&K installers). I contacted J&K, told them what was going on and THEY HAVE FLAT OUT STONEWALLED ME!
At least Lowe's is acting responsibly. I have looked at the crack hundreds of times and to my untrained eye, I can not determine if a repair was made to the crack. So, we are having an insurance adjuster come out to the house to inspect the crack. If it appears to them that the crack has been repaired (implicating J&K) then I will have no option but to go after them since they will not return my calls. If it turns out to be Lowes problem, they have told me it will be taken care of. All I'm asking from J&K is for is for them to act responsibly and come out to the house ... and they refuse.
I could go on about them, their installers and the customer service folks but in the interest of time let me just say ... if I had to do it all over again ... I wouldn't use them.