I'm using it on PC, and I think it's wonderful. it's easy-to-navigate, builds a great experience, and has a modern UI.
preview is a little bit slow, which will be fine in the final version. and it has some basic problems like clicks not working, but again, will be solved.
the new browser is awesome. it's modern, pretty, works nicely when downloading files, and has two shiny features I personally loved:
- annotation: you can annotate your web pages easily and quickly. and then share it with your team, let's say.
- distraction-free reading mode: just deletes all unnecessary things and you can read in relax.
it also has an ability to save pages offline to read later, but I haven't checked it yet.
Cortana, well, it's cool. I have practiced a little with it, and she understands my words reasonably well. and some times I asked her simple questions, she answered properly. but when I asked her to go to hell because she couldn't understand my language(spanish)
notification center seems nice too. but in the preview it's buggy, so I couldn't use it in fact.
In general, i think Microsoft has done something which should have be done years ago: PAY ATTENTION TO THE FEELINGS. people buy products giving them a professional, modern, good feeling; and in my POV, Microsoft has done a great job in this with windows 10.
These are my personal views on Windows 10
I hope this is informative.