[geerlingguy]

It is highly dependent on your needs. It's NFS, and performs accordingly (though EFS has been rock solid in a few different scenarios from an availability standpoint and a baseline performance, assuming you use dedicated IOPS).

Should you run a database on EFS? No. Can you use it to back media files for a web application that are cached using a CDN, or for data files used for processing or temporary storage? Yes, it shines in those use cases... and it's cheaper than dedicating the time required to maintain your own NFS cluster.

Even Gluster or Ceph is, IMO, not worth the effort unless you (a) know how to run and maintain it, and (b) absolutely need the potential speed up that you can get, assuming a well-configured and well-maintained system.