They're either having problems or they lied.
If you watch yesterday's games, you'll see that only one of them lets you choose a different broadcast, and that is the Orlando Vs Indiana game. They do it by having two different video feeds for the game, one with the Orlando video feed and their commentators, then another with the Indiana commentators, the other two games from yesterday don't allow you to choose a different video or audio feed.
If they are doing it with video feeds, then I am not sure if this is going to be done live. We might have to wait until after the game is over to view the other video feed. I didn't watch the Indiana game live yesterday, so I don't know if they have both feeds available live during the game. If they are doing it with video feeds, then I think this is going to suck, as I don't think they will have two video feeds going live at the same time. The NFL League Pass uses the same video feed during live games, but lets you change audio during the game. I thought the NBA was going to do it like that, as I think that is a much better system, but I'm guessing ESPN, TNT and the other big networks, might not want them putting different audio over their video feeds. Anyway, we might have to wait a while for them to sort this out.
I'm guessing they are also having other issues. I contacted their support yesterday, and still haven't received a reply in almost a day. I don't like their support service at all so far.