I also registered for the +1
While searching for a tablet with proper Linux support and a docking station I came across the Dell XPS18. I have exactly that now. It definitely is a nice tablet, but I came to know after some time that the Linux support isn't as I expected and I cannot use my 2 other Monitors under Linux. I forced myself to use Windows 8.1 now. It is working somehow but annoying me in many places. It doesn't cold-start when shutdown down the PSU prior shutdown, it bugs with Windows 10, it complains about weird things, it cannot properly copy files and on the second Monitor it is slow. The DNS cache crashes the network when modifying the hosts file. Battery runtime has been less with Windows compared to a fully blown Gnome Desktop.
Windows has many antique parts no one cares for (Mail account settings, registry, browser, properties, explorer Window features ("window on top")).
In Linux you can find those antiques as well, but you often can find an alternative and it runs stable. So I'm forced to use Windows because of the docking station as I need the two monitors. And I hate it. I can't use my old scanner anymore because HP doesn't supply the driver anymore for Windows 7+. Linux has no issues speaking with that device.
I would love to go back to Gentoo. I considered financing the docking station driver, but earlier in the thread I read about companies buying 2000 laptops and that docking station for Linux will do better than me.
I can think of replacing my Windows with Linux sooner or later again or I can find another Docking station that works fine. Problem is that the few working seem to work with the DL1x5 chipsets. I don't have that many ports on that AIO-PC XPS18.