Passed 500 miles on the pair of Cerf blues... here's what I've found:
Front tire shows no obvious wear, and has no cuts. Rear tire has an even band of wear about 1/2" wide, and there are about a dozen small glass cuts (1/16" or less).
I've had two rear flats, both from glass punctures.
The tires have not grown much less than 1mm. I continue to let out about half the pressure between rides.
I've been riding with various pressure combinations, between 70 PSI and 100 PSI in the front, and 65 PSI to 105 PSI in the rear. Tires behave well at all pressures.
Road/path conditions have been bad recently, with flooding along the river, so the tires have been through lots of rain, snow, mud, silt, sand, dust, and an occasional swim in the river. Lots of glass and other winter debris. I haven't been babying these tires.
I plan to rotate the tires this week to even-out some of the wear, and fill some of the glass cuts.
Very happy with the tires so far. They are very comfortable, especially around 80 PSI, and feel like high-quality fat tubulars. Haven't ridden with other folks much this winter, so I haven't been able to gauge the performance yet.
Aldo Ross Middletown, OH Etats-Unis
"Oh, to nod in quiescent siesta..."