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It's not that different from the old endpoints today, but we have a lot planned for SDK Connections in the future. The biggest difference today is that it works with our new Proxy Server. When used together, you can have feature changes propagate to all of your clients in less than a second. You can read more about the proxy server here: https://docs.growthbook.io/self-host/proxy

Are you going the keep "setFeatures" (e.g. for the JavaScript SDK) as alternative for "loadFeatures"? We rely on it because we don't load the API response during the request.