I upgraded to this from 14267.1002, so these are my experiences:
A Skype conversation I had in the past disappeared from Messaging. Is Skype still a part of the Messaging app?
Did they kill Insider hub? Can't open the installed app or find it in Store.
Also, is it still possible to set what is displayed on Glance screen (I don't want the detailed status but it seems the setting is gone)?
Iris scanner doesn't fire up when no password is needed (i.e. if you turn of screen but turn it on again before the timeout for new login), which is good.
Overall experience seems a bit buggier, longer wait times etc., Store is a lot slower and buggy (updating apps doesn't work, some buttons don't show any text...).
I will let it rest for a day and hopefully the performance will improve.