The toll from using cheap tires has started: I'd only just had a cycle shop fix my screw-up with my chain (I missed a small guide on one of the derailleur wheels) when I had my first flat in nearly two years. The cheap, soft rubber of my new tires had been deeply pierced by a sharp piece of glass. Those expensive tires I'd been using were worth the money.
(I've just realized that I left that tiny piece of glass sitting on a windowsill next to the road. Dangit!)