Never had an Uber driver driving like maniac. To be sure, I live to the south of SF and try to never drive into SF unless I absolutely have to, and when I do, I pretty much expect developing-country-type driving environment. But I may just be spoiled by suburbia-type traffic patterns. In any case, even SF Uber drivers has always been excellent for me. I realize that's anecdata, so I wonder if somebody did any kind of robust survey of this.