I discovered a puncture when I got out to the bike shed to ride home this afternoon. Locating the cause (a thorn about 1cm long) wasn't hard.
The problem was it was located in the recess of the tread and getting the thing out was something of a challenge, and not something that's been a problem with the Scorchers I usually run
Having said that I'm not necessarily going to go back to the Scorchers, if it turns out that the Marathons wear better for longer I'd have to seriously consider sticking with them. And for winter riding that reflective strip on the sidewall is a really nice touch...