I've got the standard Marathons that came with my MuP8, the racers. I've got just over 1500kms, and so far, three flats...2 in just the last week! On Monday, the flat was so bad my tire actually "POPED" when it went flat...as in - sounded like a balloon popping!
Took it to the shop, and they replaced the tube for free, and even put an internal patch to the TIRE. The hole was visible from both the tube and tire surface...! 1500km's doesn't seem like too much...hmmm