Update

I haven't had a flat since the one reported in April. I was going home last night in the funky light just after dusk on a busy road and hit a what I think was a pretty substantial metal object. My rear tire spit it to the side with a load clatter. No hissing and pressure remained.

Once home I examined the tire and found a cut that created a .25 inch flap in the tread down to the Kevlar. Still had pressure this morning. I think that object would have shredded any other tire and the tube.

Now I'm really impressed.