Cuz's are the only toys that my yorkies cannot destroy. We have one that lives outside..that means all summer, all winter, all the time. It looks weathered, but it hasn't let me down in the slightest! The feet are still attached, it still squeeks just as well as the day we bought it nearly 3 years ago. It is also my most playful yorkie's favorite toy. She will pick it over anything and everything else.
Glad to hear you're just as big of a fan, too! We also have a double-cuz looking thing. It's a cat with two different ball sizes connected together. The second favorite of the household is the bowling pin, though. My little ones like it since they can hold the small end of it.
All in all, anything made by JW is amazing!