Anyone who gets it post some thoughts.
Give it about 15-20 minutes and may as well charge while you do it since the phone is useless otherwise during the install. (Standard for any phone, pretty much.)
If you have a Downloads shortcut on one of your screens, it'll disappear and have to be re-added. I am sure other apps may do the same -- provided they still exist. And FYI: Downloads is appearing as icons, but there is a quick easy-to-find button in the upper right that you can click on to flip from icons to list and vice versa.
On that note, the messaging app from Marshmallow is gone. Without setting up Messenger for texts (which is SMS Messages), I had my girlfriend send me a text message. It defaulted it to Facebook Messenger and was a freaking mess. There was no other choice but to set up the SMS Messenger app so I could separate SMS Messages from the Facebook Messenger app. (And both are labeled "Messenger" in your apps drawer. Nice! Least they have different icons and you know they're different.)
And then I had to go into Facebook Messenger options and turn off SMS messages so 1) Facebook Messenger wouldn't be the default app for SMS, and 2) turn off SMS messages completely so they would be out of the list and leave Facebook Messenger as just that: Messages from Facebook contacts. Facebook Messenger was NEVER set up for this before, but because post-update I did nothing else initially, they had to go somewhere. I can only imagine if Facebook Messenger wasn't installed what would have happened.
This new SMS messenger app is also bad in the sense that it auto-assigns colors to different people, which is a direct match to the randomly assigned colored background if you view them in your Contacts app. The old one I had it set as blue for my messages and the other person was the default white or whatever and I liked it. Now they're the colored message and I'm the default white.
In the main list of messages of the SMS messenger app, if you don't have a picture of them in contacts, you will see the white letter in a circle of the auto-assigned color. And when you open it up, all messages are in that color unless you go and change it in the thread's options. If you have a picture for the contact already, you'll see the picture in the main list, but again, whatever color is in the background if you edit the contact in Contacts? That's the color you see in the thread. And there is also no options in Contacts or SMS Messenger to set a mass default for everyone's color to be the same, at least not that I have found.
Basically, I don't want a kaleidoscope. I want simple, same freaking color messages. Really, I want the old messenger app. I like change and progress, but it doesn't mean I like everything to change. Understand what I mean?
I know my messenger rant probably sounds petty to some, but, it's one of the main things I use, so it bothers me.
I will report more as I experience it.