I noticed that you can go into your My Account > Payment Details then click on Remove for the credit card or Paypal that you used. Then when the renewal date comes, it will not charge you automatically, I assume.
Also it says B1G+ channels do not stream live FB games but will show replays of FB games. It will stream select live BB games and other sports so it will be important for watching those (and Berke at Neb, if you like) along with other sports where we will most likely win B1G Championships like softball, etc.
And if you go Channels within the app, there is a visual timeline and schedule for each school of what will be showing in the future which is handy. All in all, a much better experience then the Pac12 Network site and app.
Go Bruins!