Just bought it......
1) You can only watch live games so far, hopefully they will have full games available post broadcast similar to MLB.tv
2) They don't have any of the highlights from the pre-season games.
3) The stream of the commercials being played was pretty smooth, albeit its a recording, still not too bad. The feed we will get is technically a recorded one anyway since the stream will be probably 10-15 secs behind a live broadcast.
4) One thing in the FAQs I found
"If you are receiving over 700kbps down from your provider, then you should be able to see all video content at the high setting" Good news for me

5) Oh and the app by far is the fastest to load compared to mlb.tv and nhl gamecenter app.