I'm curious to know how the Zaffiros & Roadwinners hold up as well. I like Schwalbe Marathons myself, but if the Roadwinners or Zaffiros are durable and not too flat prone (on city streets) I'd definitely give the cheaper tires a try - at least when I'm putting together bikes for friends on the cheap. If any of you city riders have put some miles on them I'd be curious to hear your thoughts.