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@Pish
I'm riding on 28mm Ultremos most of the year, mostly in town - and they are amazingly resistant when you consider how thin they are.
I managed to get about 5500 km from them, punctured a 4 or 5 times (pinch-flat mostly, due to my non-existent skills when it comes to hopping curbs).
Their only real weakness are sidewalls, which are very thin; if you scratch it between cobbles or so, they are pretty much toasted.
I use 28mm Duranos for the winter ; I'd say the grip is a bit inferior (but as @cable says, it could well be an effect of the stiffer casing). Much more compound in the middle, which should give a better mileage.