"a vast array of benefits" is correct and usable in written English. You can use it in any context where you are discussing a wide range of possibilities or advantages. For example, "The membership of our organization comes with a vast array of benefits, such as discounts on travel and events.".
37 Although it was evident that community-based teaching has a vast array of benefits, several drawbacks were identified and underscored as challenges to the implementation of CBE.
If the justices do strike it down, they will sweep aside a law that has for years prohibited gay couples from receiving a vast array of federal benefits that married couples take for granted.
Clean water has a vast array of health benefits, and may help digestion.
Apple Cider Vinegar is said to have a vast array of health benefits.
He called the registries "the legal gateway to a vast array of protections and benefits and responsibilities".
In most Indian states Walmart and other stores will be required to buy produce through a monopolistic distribution system that compensates farmers poorly for their produce while benefiting a vast array of middlemen.
Marine researchers predict the move will benefit a vast array of marine creatures by helping protect relatively remote and intact ecosystems.
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Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu