Well I got some of these in 25mm folding (measuring bang on 25mm using digital calipers on Open Pro rims), and have to say I took them straight off again after a 40-mile ride.
They're about as comfortable as riding on solid tyres, even at the lower end of the recommended pressure range. Every time I rode over a a largeish bump the bike would be jolted due to the lack of give in the tyre, usually causing the front light to rotate downwards and switch itself off. This was having changed from '28mm' Gatorskins (measuring 26.5mm wide), which are light-years ahead in terms of comfort, and with which none of the unpleasant jolting and front light problems occurred.
How the people here running them at their stated high pressures stand this goodness only knows - their road surfaces are presumably not as god-awful as mine.
So it's back to the Gatorskins for the time being. Whilst the Gatorskins have been very good, I'm still keen to ride with slightly more robust tyres during our grit/gravel/mud/flood-strewn winters if possible, but only if they are not as stiff as the Durano Plus. I'm considering the Gator Hardshell 28mm, which like the Gatorskin looks like it has a considerably larger volume of air, and hence better cushioning, than the Durano Plus. I think one of the contributory factors to the Durano Plus's problem is that the actual volume of air is more equivalent to a 23mm tyre, with the extra width and height taken up by the thick protection strip - combined with the extra-strong sidewalls, this means the comfort price paid for extra puncture resistance is just too great for me. I suppose the 28mm Durano Plus would give more volume, but at 150 grammes per tyre heavier than the 25, I won't be trying it, and there probably isn't enough clearance anyway as it is no doubt close to 28mm.
Maybe the 28mm Gator Hardshell will be a better compromise - has anyone ridden both this and the 25mm Durano Plus and therefore got any anecdotal evidence for their relative levels of comfort? A bit of research suggests the Hardshell 28mm also comes in around the 26.5mm mark, so it should fit.