I got ANOTHER flat on my way home--the third in one week and just ~30 miles after the last tube went on the rear tire. I appreciate how easy it is to change the Kojaks (takes a LOT less effort/elbow grease to get them back on the wheel than the Marathons or Brompton tires), but really?? I have my old Marathons in the basement and am considering swapping them out tonight. I'm heading out on vacation this weekend though, and I really don't want to spend it changing more flats. Ugh. Maybe it's time to eat another $70 and pick up a pair of the Marathon Pluses. Thanks for the input, all!