Ok let me start by saying I have two odd feet thanks to a foot surgery several years back so I take shell fit quite seriously and as a result go the extra mile to customize my boots so I have a proper fit on both feet. So I do get the right fit/hold but now have to tighten the boots more than when I first got them. The stock liners were ok for the first half of the season, but seemed to pack out a fair amount by the second half. From day one they were not super warm but as the season went on and I had to tighten the boots further I realized that a better liner would likely improve my boot fit/performance and address the cold feet. My boot fitter/friend agrees with this but his shop only carries intuitions. If I am going to invest in custom boot liners I would like to get something that I can transfer from boot to boot and that will last much longer. I also like that you can continually customize the zipfit liner, so if I have another foot surgery, which is a possibility I can potentially just adjust my liner as opposed to replacing them like I would with an intuition or foam liner - boot however would need to be replaced in this case.
It was actually cantunamunch's other posting comparing boot liners along with some additional research that helped convince me that Zipfit would be the way to go. So not just looking to get an extra 40 days or warmer feet out of this investment