I just tried the most recent build of Darktable under Windows 10.
darktable for Windows - darktable - discuss.pixls.us
I have to say I like it a lot. And while it is different and obviously new stuff means learning new things, I think I would have learned it faster than compared to LR.
It works very stable.
I especially like to option to configure a set of favorite tools in the right pane.
Also I like the map view option as I am very unhappy that Adobe simply stopped map support for version 5.7.1 recently.
Online manual is here:
darktable 2.2 | user manual | darktable
Offline manual:
resources | darktable