Has anyone used these? I saw them in the Valley Vet catalog that came today. This is probably my biggest gripe about winter - heated buckets and tubs do no good when the darn hose freezes up. I had thought to go with a collapsing hose (even with the best draining, our round hoses hold enough water to be a pain), but have yet to find one around here, and then saw this. Seems like a great idea IF they really work - so hoping for some input.