I used Allstate with no issues in California.
Only problem is they do not take new policy holders for Motorcycles. They only insure existing policy holders, so if you don't have Allstate Motorcycle insurance already your SOL.
It's basically Allstates way of getting out of a lossing proposition will following the law. Each year their total number of policies go down as people drop them for what ever reason. Yet they still offer MC insurance which they need to do by law. And with all the idiots who have no clue about riding, go out and buy their new 600, or 1000 sport bike then turn it into a pile of twisted metal within 100 miles, the insurance companies just can't make money off the policies without making them so expensive for everyone that they wouldn't get customers.
Allstates way of doing things gives them a customer base of long time riders, who are less risk to cover. This keeps their customers costs down year after year. I know I had full coverage on my NSR for about $100.00 for the year.
Now I use Geico in Georgia to cover a custom motorcycle I built from scratch and is valued over 30K. I pay about $300.00 for the year for full coverage.
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Charles Gallant