I've experienced several problems. I expected problems but, in all honesty, they are kinda annoying... and yet, expected.
There is an issue with the home screen getting stuck on "Resuming" (Yes, Home Screen)
Live Tiles do not update accordingly to the application data (Mail, facebook, messaging)
Lock Screen suffers the same problem mentioned above, this (I believe) is caused because the live tiles and not the lock screen itself
Powering the phone to unlock it has a strange behavior. The background appears (onlye the BG) the screen flickers and only then appears the date, time, quick icons, etc.
Can't take photos from Whatsapp
Pinning things to home is awfully buggy.
And those are the things I've experienced. I already reported them to MS via the feedback app. If you're on slow ring and do not have those issues... I would sugest you to stay in your current build.