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I noticed another user has already commented, sounds like they've had more experience with the things you're interested in than I have, for FWIW, the APIs have been sufficient for my use cases and you can definitely purge a pullzone's cache with them.

My primary use has been for serving image assets, switched over from Cloudfront and have seen probably a >80% cost reduction, and no noticeable performance reduction, but as I mentioned I'm operating at a scale where milliseconds of difference don't mean much.