Yes, we've run billions of requests through them. They have the best performance and the lowest-latency, along with running globally instead of a single datacenter. It's just javascript so you can use npm packages and compile the final script to deploy.
Does it guarantee some sort of high availability? Like if two of your datacenters are struck by a meteor would a third one serve my audience? (same question for you workers KV)
Cloudflare is a CDN so they're designed for high-availability with over 100+ datacenters.
CDNs are designed to forward requests to a origin server and cache the results, but you can serve your site completely from Workers if you embed all the code and data into the deployed script or store content in KV.
