Just changed my Avon 18" ZZ3 this summer to the new Avon 18" ZZ5. ZZ3 no longer available...
Tread pattern quite different but overall the new tyre seems a good deal better, and quite usefully on the Mog runs pretty quiet. Having said that I bet the Toyo or a Yoko has better grip but there was concern from my dealer that some of these rub on wings as tyre profile can be different. I'm surprised about this but respect their views.
I thought the steering felt better too...