I signed up for MetroMile on 6/15/18. I received the device 2 1/2 weeks later which didn't work. They did, however, begin to charge me 150 miles/day because they didn't get a signal. I'd tried to contact them via phone, email, and even Facebook Messenger to tell them the device had been plugged in for a week but still wasn't working, and it took them 5+ business days to respond to me. And they did so over Facebook Messenger. They finally did reverse the charges and sent me a new device, but I'd also threatened to report them to the PA department of Insurance.
I am convinced they are understaffed and can't handle the volume (just check out the Glassdoor reviews.) I have decided to stay with them because my base rate is 1/3 of what it was with Liberty Mutual and 1/4 of Geico and Progressive. However, I have a feeling that I will have significant delays if I ever have a claim.
If I drove more than 1-2 days/wk, I'd drop them like a hot potato, but I drive so seldom that it doesn't make sense to pay $100+/mo when I can pay $50 or less. I walk to work and bike around Center City Philadelphia, so Metromile works for me. But if you use your car for work or other necessities, I would not recommend this company.