As others have found, I find them pretty much bomb proof and last a phenominal mileage. I have had punctures in them several times - direct hits from a well seasoned thorn or well positioned pyramid of flint shard or even a wire brush bristle from a road sweeper are pretty much impossible to stop though. I have used the 26X1.5 version on the rear and like sized "city slick" puncture protected tyre on the front of my "mule" - long distance tourer/ideal commuter, shopping bike for ages.
However interestingly not long before this snow a few days back, due to wishing to traverse longer distances over these Welsh hills off road and regarding my mountain bike as no more than a "shopping trolley" totally unsuitable for longer distances. I chucked them off, I now have a pair of much more grippy very cheap (think skip) X/MTB type tyres 26 X 2". As I have discovered in the past these very cheap, old fashioned, canvas carcassed tyres, although more prone to punctures are very easy to remove and fit with no tools except a pump, are far lighter, more lively, faster, more secure to ride on and as flexible as any top shelf tyres and who cares if they don't last long? I'am finding them much more fun and far more suitable in the present mud and snow, even if I do go down the road sounding like a Landrover!
