I've commuted on racing tires for the past 3 years and get very few flats, but the roads are pretty decent where I ride. I'm currently running Conti GP 4 Seasons and have previously used Conti GP 4000s, Michelin Pro Race 2s, Michelin Axial Pros. I briefly tried some Panaracer Pasela TGs but took them off my bike after a few weeks because they felt so sluggish compared to racing tires - plus I got a flat!