Like Trainroomgary, I used K-Line Shadow Rail tubular track when I cleared my layout and started over with a new track plan in 2006. All eight of my switches are 0-72 K-Line as well. I originally bought a spare right and left. After the K-Line demise, I bought another spare pair when Lionel reproduced them. Eight years later, all eight original switches are working perfectly.
I often enjoy running my Third Rail brass 4-8-2 SP Mountain with its sound off to enjoy its smooth and silent running on the K-Line tubular. I have always attributed that to its sprung drivers.