Comment by hidelooktropic

The Uber comfort designation frustratingly has nothing to do with the condition of the vehicle. I believe the parameters are age, seats, and model.

From the driver's point of view, it just means that you are allowed to accept comfort rides but most of the time you're probably going to be picking up UberX passengers which are more plentiful. That means you're only slightly more likely to get one of the good comfort vehicles if you actually select the comfort tier.