We just bought a car (after not having one for several years), and we signed up for Metromile because it seemed like the best deal for us. We haven't had the car for very long yet, but when we were shopping around for quotes it looked like given how much we were planning on driving our car, Metromile was going to be a good $20/mo cheaper than most of the other companies. I can update later once we have a bit more data.