There is an early access version, and I'm currently in limbo over cancelling Dish and either going with the Vue in hopes of a future leanback enabled app, or renting a cablecard and using an HDHomeRun Prime. With HDHomeRun Record we could use the Shield to record from our cablecard which sounds great, but I don't want to dive in without knowing if it works well or not.
I am in, I haven't checked recently but they still haven't implemented DRM support.
Right now the Kodi app, Windows app, and the Shield app(the gray one) all work for recording non-drm shows.
The green Shield app will still play DRM but you can't record anything. Well, you can record it but it won't playback.
They are well over a year past their goal of when this was supposed to be shipping.
It'll happen eventually but it's still very much in alpha stages. I wouldn't waste the money yet