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Well, that's almost 600 km done on them so far over a variety of roads including gravel, cobbles, dirty b-roads full of twigs, flint and other debris, snow, ice, rain etc. and they don't have a mark on them.
I checked the pressure at the start of the Festive 500 and then just left them alone.
I know 600 km isn't an exhaustive/long term test but so far so good.
I should point out that the GP4000's I replaced hadn't punctured once if that's any recommendation and I did about 6k miles in all conditions on them.
Oh good.
I took them out and tested them today and they were very, very comfortable - even over some cobbles - and, thankfully, no punctures so far.
I was rolling over some pretty horrible stuff so I'm going to do some hoping.