Thank you for the original bump and the feedback on your Schwalbes, Claykan! This thread somehow escaped my attention. Sorry Cy-king
I have also read a lot of good things about Schwalbe tires, especially the Marathon and Marathon+. Have you run yours on wet pavement? I'd be curious how your experience stacks up with what QMS stated above.
I live in CO where there are plenty of goat-heads. I run Continental Touring+ tires in 700x42 at the moment, but my primary flat protection strategy remains Slime, which works great on punctures under 1/8" in diameter. I once picked 8 goat-heads out of my front tire in one sitting. I ride hard-surface dirt and pavement.
I did run the Touring+ tires without Slime for a little over a month and 400mi during the summer - I incorrectly believed my tubes to be pre-Slimed. They flatted pretty close to one-another right around the 400mi mark. No trouble before that. That's much better performance than I got out of the stock Contis my bike came with, but still short of your experience with the Marathon+.
Sounds like our cycling routes are similar. What part of the country are you in, if you don't mind me asking?