I'm using a Lumia 640 and it works very well. I believe W10M is definitely a step forward. I'll give a little pros and cons list of what I can remember right now:
Pros:
Now with the Cons, just two that frustrate me:
Well, thats about it.
Pros:
- More items for Quick action. (flashlight is great to have there)
- More options to customize the start screen
- You don't have to drag the colored bar to close the Action center, you can drag from any empty space on it.
- Double tap the nav bar to lock (don't know if that was on 8.1 too)
- The File Explorer app is a lot better than de Files app.
- The Alarms & Clock app adds Timer, Stopwatch and world clock.
Now with the Cons, just two that frustrate me:
- Strange scrolling. Sometimes just flips out. Its a pain. Sometimes I want to scroll a little bit but when I release my finger it scrolls a lot.
- Having default apps to resolve links. This is basic, but still not resolved. The twitter app cant even recognise its own links. Can't open Instagram links on 6tag, etc. Everything goes to Edge...u.u
Well, thats about it.