Last time, and I do mean the last time, I took Uber, my credit card was charged for several special fees I hadn't heard of. (Yes, they showed up on my phone before I completed my transaction, but by then it was too late to make another ride choice.) I decided not to use Uber again, preferring the upfront pricing of Portland's traditional cab companies, where charges doesn't fluctuate hour to hour, day to day, or week to week.   It's too bad, I've always had courteous and helpful Uber drivers.