We had Liberty Mutual for years. Never had a problem with them, but then our premium kept going up every year so we shopped around and decided to go with a local State Farm agent. They may be cheaper but we've had TONS of problems with them getting our information and billing correct.
They kept getting our old trailer and our new trailer mixed up. They somehow had one of our vehicles on the policy twice. Then when they cancelled one of them the loan company for our trailer (Bank of the West) somehow thought we cancelled our trailer coverage. That took 2 or 3 phone calls to finally get sorted out. There's probably a few more things I'm forgetting.
Cheaper doesn't always mean better.