Lots of fun for certain of us who like development, meaning have skin the thickness of a rhinoceros. I did catch the Photos issue last time around and the Start menu crashing struck me as sloppy QA but I haven’t seen any of the other issues. For anyone considering joining the Insiders program, you’d better have a dedicated box with good image-level backups to even consider this stuff. It is kinda fun if you have a masochistic bent...
I would not only second that, but say that you should be prepared to re-install from scratch on a moment's notice. Insider Previews are for people (like me, to be honest) who are willing to take chances. That's what spare hardware and VMs are for.
I rather liked this one in the latest:
"Navigating to Settings > Update & security > Windows Update may crash Settings app. You can simply re-open the Settings app again and it should work again."That's a click-path that I would never want to see crash. Talk about undercutting confidence. But I understand, because that's the way Insider releases are.
Not for the faint of heart! :-)