I've actually used it more for entertainment than business though
Colour me unimpressed.
I can already connect my S5 to any HDMI device with a cheap adapter and I recently used Miracast / WiFi share on a friend's TV the other day. Fantastic for entertainment.
Samsung have been experimenting with this kind of thing for years (my Galaxy Tab 8.9 came with a "multimedia" dock) including support for multi-windows and alternative input methods. It wouldn't surprise me if they aren't the first with some kind of phone / TV / Chromebook setup. And we can assume Apple won't be far behind with its own extremely dedicated market.
Microsoft is going to pull something extremely remarkable out of the hat for this get any real traction. Otherwise UWP apps on Android might be the best they can hope for.