Schwalbe Marathon tires are terrible. Any serious commuter needs practice fixing flats, and these tires will just not give you the required practice. They just keep rolling for thousands of miles without ever flatting.

My commuter has a Schwalbe Marathon Plus rear tire with over 6000 miles on it. Never a flat. If I were to get a flat on my commute in, I wouldn't even know what to do. Don't leave yourself as unprotected as I am - go for an ultra lightweight tire that is easy to mount. Get plenty of practice patching tubes.