They are very durable. Fast rolling too.
However, as with all tyres, if you look after them, they will look after you. Before and after every ride, check the tyres for any crap that's sticking to/in them. Dig that crap out so it doesn't work it's way in. It's a pain checking all the time, but less of a pain then a puncture.
Grip is excellent in winter and the wet, faster than m+'s IMO less resistance to fairy visits but still pretty good resistance. Only hawthorn thorns that I have had an issues with and only the once in +10,000km of use.
I'm using Delta Cruisers and they don't puncture much more than M+. Ordinary Marathons seem nearly indistinguishable from M+ in puncture protection and the Fietserbond's tests suggested they roll much more easily.
There never used to be much to choose between Schwalbe, Michelin and Specialized's protected offerings, but I felt Specialized changed for the worse a few years ago... I actually took an Armadillo Nimbus OFF one bike before it wore out.