I’ve been buying from B&H for many years, and had a wrong item shipped to me once. They made an exchange without any big hassle. The only issue I have now is they’ve switched away from UPS as default shipping—-UPS ground NY to Boston is basically next day, FedEx Ground service is two days. I liked going to the store in NY when I lived there.
I have bought various electronics and camera accessories from B&H with no issues (related to B&H).
However, I buy all my new camera bodies and lenses direct from the manufacturer. I have found the price to be identical (or nearly so) to B&H, shipping to often be free and from time to time, without a local tax. If Nikon, Sigma, etc are selling as 'new' what are returns/refurbs then there is no hope in the system at all.