just to let you know that goo layer in the marathon plus does add a teeny bit of "vagueness" to the handling but it seems to roll just as well as any other tire i have used...

so far i got a couple hundred miles on them and i would recommend them based on the smooth ride and lack of flattage so far. but truth be told it will take a lot more miles too see if they really are flat-proof (or at least 99% flat proof).