Compared to what? I bought a set of cheap tires last year and flatted on my third commute. First flat I've had in 10 years of commuting. Had to change the tire in the cold rain. Cut my finger finding the piece of glass that cut right through the thick part of the tread. Was late for work too.

In contrast, my marathons (supremes and now a set of XRs) have never had a flat. The supremes have logged hundreds of commutes over broken glass and other kinds of debris. The XRs are on my touring bike and have been great too. Personally, I'll never buy cheap tires again. $70 for a tire isn't much if you don't need to replace it until the tread wears out.