Not worth it
Living in Minnesota, I wanted a "system" that would allow me to keep running outside in the winter. I selected the TNF Ultra GTX 103 shoe and bought the gaiters to go with.
I very much like the idea of an integrated system of shoe and gaiter. I find TNF's execution of that idea, however, lacking. The gaiter seems to be made of good material and is high enough on the ankle to keep out snow. The hook system, which attaches the gaiter to the shoe, is difficult to use and didn't keep the gaiter attached while running. The stitching also began to unravel on my third run, with the Gore-Tex material separating and leaving a hole in the gaiter. The gaiters are now unusable after a week.
Overall a good idea, but as designed and manufactured, I'd avoid this product.