I've been riding Marathon Plus for over 3 years, they changed the design about 2 years ago, the newer ones fit and roll much better than the older/original ones. The originals, I could not get a flat and very tough, I've moved to the newer ones 3 months ago and too early to judge. I've not had a flat for over 3 years and I ride about 200miles/week. I had flats with Marathons and with Stelvio. Marathon Greens I had sidewall failure. Stelvio got flat in 100 miles.