I looked at the AirTv but I see its DVR functionality is above "minimal" according to reviews
DVR capabilities remains a letdown as well. When setting up a recording, the Sling app only provides three options: All episodes, new episodes, or a single episode. You can’t add padding time to recordings, schedule manual recordings, or automatically discard older episodes of a show. And while the Sling app provides a one-time alert if you schedule more than four recordings at a time, there’s no schedule view or priority list to help avoid future conflicts.
the AirTV doesn't buffer live programming so you cannot pause and rewind live TV.
While it sounds like for some folks it would work fine, for me its a no go mainly due to the bolded.