I got a two month promo emailed to me from Sling. I decided I would give it another try. Surprisingly I haven't had as many issues as when I first signed up for it. Probably have as many blips right now as with the Directvnow service I signed up for. Love the way it looks as far as the UI. But much like Directvnow it suffers from not having a DVR function. (I know they are beta testing that right now)
Also, on demand stuff is kind of spotty like Directvnow. For shows it seems it only offers a handful of episodes, and most of the time they are random at best. Seems like it doesn't have the same rewind feature as Directvnow. It also seems like you can only add certain stuff to your favorites, compared to Vue where I can practically add anything with their service.
At this point Vue still offers the best value. It may not offer the same pretty UI as Sling. And it may not have the same $35 channel offer as Directvnow. But you have a true DVR, tv everywhere logins for almost anything. Very little to no glitches. It seems Sling and Directvnow have a ways to go before catching up to Vue. But I do like the competition that all these services provide. And I am looking forward to testing Hulu's live streaming service when it comes out next year.