I can't stand thick bars. Granted, I have average sized hands (size M gloves) but I like to feel like I can easily and comfortably wrap my hands around the bar without making my hands feel equivalent to my butt with three pairs of shorts on (all with chamois). I have some of that Specialized bar phat on my rain/commuter bike and it's nice for all the long miles on an aluminum frarme (and bars), but even then I still prefer a thin no-nonsense bar.