Which means that Windows 10 users can enjoy the best of both worlds: A productive and mature desktop computing platform that also happens to have a mobile apps platform built into.
I find their older apps that were there from the start have really formed well too.
Of course the newer are buggy or lacking, but feedback hub is always there to report them, and send screenshots or to reproduce the problem and it will record what happens on the system, then you can send the report with the feedback.

I really like the Office Mobile apps.
If one can only afford, or only needs Office 365 Personal(1 PC and 1 tablet and one phone) and has even more devices or Windows 10 virtual machines, the mobile apps can be fully used to make changes to documents, where as with out the 365 license, they are read only, which is ok to open document, spreadsheets, and powerpoint.

I use them when I'm on my laptop, and they work great for simple things.
And...
They are improving all the time.
the speed at which they are improved, are good signs for the future.
Bundled Mobile Apps are a Bright Spot for Windows 10-image.png

Just like other UWP apps, like OneNote, Mail, Calendar, People and my favorite, Skype Preview(now has desktop sharing even) which is just as useful as Skype for desktop now!:)