I'm not saying anything that hasn't already been said, but just wanted to further support the Schwalbe Marathon Plus statements.

I commute everyday here in colorado 24 miles RT on some roads that have a lot of "stuff" on them, and with most other "tough" training tires on my road bike at best I'd get a flat every other week. Since putting these on around 1,000 miles ago, not a single puncture flat. I don't even try to avoid debris anymore only big things like 2x4's

They're not expensive ~$35 a tire, and last around 5-8k miles, can't argue with all that.