To use the UWP office apps to edit documents on a screen larger than 8" requires an office 365 subscription. Is that the case with this too?
If so then I can't see the benefit. Any windows laptop has access to the office apps and you can use your 365 license across your iPad, android phone, desktop and laptop.
Also, docking with the laptop part is via miracast or USB cable, this doesn't sound like much of a "dock" to me. I was expecting some kind of slot that the phone fitted in to. You can buy a decent laptop and a Lumia 950XL for the same price as this package and it will do more stuff, including allowing you to use your phone from your laptop (if for some weird reason that is something you want to do).