9 days and 144 miles later....

Well I've given up trying to intenionally puncture these tires. I took the bike out to an empty parking lot after a baseball game and rolled repeatedly through what looked like a blanket of broken bottle glass, this with the tires underinflated at 85psi. No punctures, no embedded glass. I guess all that's left is carpet tacks and nails. That should certainly do these tires in.

Wet weather review: the siping on the tread is generous and deepest near the sidewall, flinging water violently at speed (use fenders!), and making for very good wet cornering. Wet debris had no more affect on these tires as dry.

After riding both the Primo Comet 1.35 and 1.50, I'm used to plucking-out embedded debris from the tread. That has not been the case at all with the IRCs. Inspecting the tires now, I can't find a single cut in the tread anywhere.

My short-term testing results give the IRC Metros four out of five grins:
(They missed the perfect score of 5 because they didn't inflate themselves.)