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You get type safety in your API, you get autogenerated client code, and you get http2 out of the box.

Personally I find the autogenerated client code to be the biggest upside. Anyone who wants to use your API, in any language supported by the RPC, can start doing it with very little work. Gone are the days of maintaining officially-supported client libraries.

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I'd more say that it gets rid of the need for officially-supported client libraries, but such libraries can still be a nice convenience for idiomatically mapping your service's higher-level concepts to what makes sense for a given language.

Still, it's a big win to automatically make your API available in all gRPC-supported languages, since most companies can't justify the business cost of a hand-crafted library in even one of those languages, let alone all.

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