Win10P on a T-Mobile 635 here...
Phone runs about the same in general terms.
No more pesky "resuming" when switching from app to app or back to the start screen.
However there is a blank screen seen for a couple of seconds at times when returning to an intense task.
The settings options are organized under categories.
Still needs work in my opinion some utilities are placed oddly under the headings.
Extras under settings comes up with a white screen the fonts on this screen are small.
I've been having trouble getting the options on this screen to show by tapping.
They will open its just hit and miss.
There's a few more tile options at least the people tile can be resized to tall.
The camera apps sure seem to process much better.
The default camera opens right now when tapped.
Options for the default cam have really been trimmed down.
Some of it's features are gone.
Videos shot with the 635 are very good.
Smooth with great sound.
The system photo app has new options.
Still trying to figure a few things out like selecting pics with the teeny tiny hamburger menu.
That thing is hard to hit with six inch wide pinky's :/
Battery time might be a bit less.
This could be because I'm putting the phone thru the paces trying to learn.
I'm not too sure about the start screen tiles transparency levels being opaque with the ability to change color.
I have mine set to steel so the start screen looks better for me.
This is an ok feature I guess...
The pull down notifications are all inclusive or have more stuff anyway.
Looks like things might change here in a final release.
One disappointment no data toggle that I can find.
Also "all settings" has been added to the selectable toggle tap squares.
For T-Mobile users or at least me after installation Wi-Fi calling is malfunctioning again.
Tried removing-reinstalling and soft resetting.
Still a no go here.
All I can think of for now.
I may want to hard reset.
Goofed up my SD when I forgot and unplugged the phone from USB without disconnecting thru explorer on desktop
Damn me...
No biggee this isn't the phone I depend on.
Update1:
Total reset accomplished.
For some reason on the initial download and install even though I chose start fresh from the back-up screen I ended up with things from the previous incursion.
My usual luck with backups
This time the preview is a pristine ground up install.
Much smoother now...
Also the baked in file explorer is proving very handy.
Wi-Fi calling is also working now.