I have a Golden Retriever, and these JW whirlwheels are her absolute favorite outside toy. Summer, winter, doesn't matter - she still wants to play fetch with them. If one is half-buried in snow, she will frantically search the yard for it. Having said that, we tend to go through at least 2 of these a year (which is not bad considering the amount of use they get). Usually the part that wears out is the "ball" in the center.
I've ordered these several times now from PetGuys.com and the price and shipping are excellent. I usually order 5 or 6 of them at a time. The colors are random, but I made a special request for mostly blue ones (her favorite) and they did their best to honor that. Greatly appreciated!