I've had the update for over a week, and I personally do not like the changes. It is slightly more cumbersome to look for friends, and having to click on the home icon to actually go home is annoying. I also liked the large window for the active game/app, and now they have made it almost the same size as the pins. I am not sure why they made these changes.
Beam is actually pretty quick to integrate. Start a game, hit the home button, scroll down and select beam and start broadcasting (I wonder if Cortana can automatically start that with voice commands). What would be nice is if you can select watch stream from the friends list when someone is broadcasting, as there is an icon saying they are broadcasting, but I do not know how to do it. That would make Beam even better. They should also allow to watch streams on the Xbox app, but I have not seen the Beam icon on the app yet.
Xbox and PS3 Gamertag = Xerostomia
Wii = I'm too lazy to get the number