Here's an update:
I now have 2,090 miles on this chain, and it is still fine. I checked for stretching, and it still hasn't reached the .75 point on my Bike Hand gauge. But remember that chain stretch depends on so many variables, that this doesn't tell you anything about wear with wax.
It does get some rust on it, but I've never heard any squeaking.
Last night I thought I'd try soaking it in Ospho to remove the rust. That was probably a mistake. This morning it was a green and black goopy mess, and somewhat fused together! I'll see if I can get it cleaned up, but if not, I've already purchased
this chain for the rainy season. That should solve the rust problem.