I've just purchased from the Windows Store. There's a couple of niggles with it though. For one you cannot disable V-Sync, Nvidia Geforce Experience doesn't recognise it and ShadowPlay doesn't work with it. I can understand the GeForce stuff not working, but the V-Sync is a bit of a bummer since I have GeForce monitors.
On the plus side though, When running multiple monitors, you can pause the game and do something on another monitor without it flicking into windowed mode or having to Alt-Tab out.