I felt like I had to offer another opinion with all the terrible reviews here. Although I've never had to file a claim while I've had them (since May 2015), so I can't speak to that.
I have had to request roadside assistance when my car died on a busy San Francisco street. I called them, and they told me it could be up to one hour but it ended up being only 30 minutes until the guy showed up. He was super nice and told me he would tow it anywhere I wanted. It was a very smooth process.
Other perks: cheap (obviously), and I love the street sweeping notifications even though they are usually wrong (like I'm parked on the opposite side of the street), but still such a helpful tool. I also like that I can see the location of my car in the app if I can't remember exactly where I parked it last.
Metromile was recommended to me by a good friend who recently got in a pretty bad car accident, and she has mentioned zero problems with the insurance or claim process.
So, just my two cents!
Bottom Line: Yes, I would recommend this to a friend
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