It'll probably be a while before this becomes mainstream, but what I've read so far looks really attractive. Especially support for snapshots, which is something I've been wanting ever since I discovered them as a part of Network Appliance's file server software almost 20 years ago. I assume Apple took so long to develop the tech because they were waiting for NetApp's patents to expire, or some other non-technical reason.
Once this ships (and has gone through the usual rounds of bug-fixing to fix the inevitable problems in something this big), it will be a truly compelling reason to upgrade to the latest version of Mac OS X ('scuze me, macOS.) Which is great, considering that the last few OS updates seem to be mostly cosmetic and app changes - things that really shouldn't need a whole-OS update.