I used to be covered by Liberty Mutual under my father's policy. It is likely I would not go back to them because their agents (at least the office in New City, NY) are total lazy bastards. I would have to hound them constantly to get things done.

I have progressive now and it is like night and day. If I want a car on my policy, someone always answers the phone and does it right away. Taking cars off is just as easy. Just fax over the receipt the DMV gives you after surrendering your plate. It gets taken care of without talking to anyone. Excellent service.