Prudential is a legitimate company that’s been in business for over a century. It has an A.M. Best rating of A+, which indicates the company is financially sound.  Plymouth Rock Assurance — the company through which Prudential distributes car insurance — has been around for over 30 years and offers several policyholder benefits, such as insurance discounts, online account management, and car pickups when you need repairs. Plymouth Rock Assurance also has a strong A.M. Best rating of A-.