There are three different qualities of Cognac recognized by law: V.S., V.S.O.P., and X.O. (the names are in English, because the Cognac trade was originally developed by English speakers). V.S.O.P. stands for “Very Superior Old Pale" and designates a blend in which the youngest Cognac has matured in the cask for at least four years, but the average age of the wood is much older.
Like Cru, producer, price, and everything else that goes into a Cognac age doesn’t necessarily mean you’ll like it. It just means that it’s legally certified to have been aged in oak for that amount of time. There are excellent Cognacs at every level, you just have trust your taste buds.