The Better Business Bureau has given Vanguard a B rating. BBB ratings typically range from A+ to F and reflect the bureau's opinions of a company's customer complaint history, business practices, and advertising and licensing information. Other factors the bureau considers include time in business, type of business, and government actions. But the BBB also states that its ratings don't guarantee a company's reliability or level of performance. For this reason, it's important to conduct your own research as well. Vanguard has closed more than 200 complaints in the last 12 months, and it currently has two unresolved complaints, according to BBB data.