Timely post, I just looked tires over on our bikes today.
I have a touch over 14,000 miles on my front Avon Storm 3D, and I would replace it before going on a long ride, but for my local commuting it will hold up for a while yet.
The rear has 6K on it, and still looks excellent, but I didn't measure the tread depth.
I have used Avons on my Kawasaki 1500A and Nomad, and the wet traction is every bit as good as I would expect. I am also a person who will not sacrifice wet traction for long tire wear, but I have never gotten this kind of life out of Avons before. I think they finally have it figured out.
I have also used Metzlers, and on my Nomad, I swore I would never use them again, and this LT came with them. The rear left me sitting 180 miles from home. A friend rescued me that time, and he has just started using the 888, so we will see how those do.