Has anyone tried Root Insurance? Is it a good switch?

I’m really tempted by Root Insurance because their initial quote is significantly lower than what I’m currently paying with a traditional insurer. They say good drivers can save a lot through their app-based tracking. However, I’ve seen some worrying reviews about rates going up after the initial “test drive” period and difficulties with claims. For those of you who have tried Root, what was your experience? Did your rates stay low, and how was their service when you needed it?