It is probably going the way of the wool-filled sleeping bag; it works but there may be better products. I have never liked the silicone boot treatments, they just don't seem to be a "real" treatment. I always liked the ritual of Snow Sealing my boots before a climb. I especially liked the aroma. Of course, I knew Ome Daiber casually and the original Snow Seal was sold under his name. It was made in Seattle, where I lived, and was used on climbing, logging, hiking and ski boots. So, loyalty to a regional product and to a climbing acquaintance was one reason I used it, the other reason I used it was because it worked. You can still get it at Amazon BTW.

The ascendency of plastic ski and climbing boots and fabric hiking boots and shoes may be the main reason for its decline though.