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I've had 2 flats in what must be 10k miles, and to be fair I get my money's worth out of the tyres (I run them all the way down). One was definitely due to that and the other was some glass that I saw too late, I knew it could happen as soon as I rode over it.
Fingers crossed I haven't now cursed myself but I really rate them and they are often available on decent deals from CS, Evans etc
I may well switch back... Although after fitting the marathon greenguards the other night, I did go online and buy another pair from wiggle (as they're only £13 apiece at the mo'). How many punctures have you had with the kevlars over how many miles?
Oh, and I bought some Ergon GP1 grips. I originally got cheap chinese copies of the ergo grips with little bar ends, but the bar ends are useless, take up a bit of room on the bars and kinda stab the mudguard when folded, so have gone for the real thing. Massive improvement over the standard grips.