Lima, Peru:
Great service. I was absolutely pleased with the service they had, and the drivers were genuinely friendly (everyone in Peru is for the most part). Longest it took was maybe 10 minutes, but only in certain areas they were available. Cars were mostly Yaris, Corolla and a Jetta once or twice.
The Uber X had waters available and they would literally run out the driver seat to open the door for you. They always asked if I wanted to use my music via Spotify.