I'm 210-ish, and I love riding 23. I am a pretty terrain-conscious rider, avoiding anything that might pose a threat (when I can). I've currently got 28s on my wheels out of necessity -- worn-out 23s got cut on some glass and all I had were some cheapo 28s. To be honest, I can feel the difference in rolling resistence, but it's fairly negligible. The ride is a bit smoother, but that's the lower pressure, I believe. I'll go back to 23s when my budget allows for a nice set of tires.