Had no hiccups either, the update went fine.
Now, the big question: What changed actually?!? Even on Github it is not documented in MuditaOS changelog - PurePhone yet what was the change for v1.5.1 or v1.6.0. Though, a big number of interesting but unreleased changes is listed. Mysterious …
Update: It is not so mysterious as thought 
@urszula provided a preview of about the changes in another thread.