They are great.
We get a full passenger list with a seat plan showing all passengers and empty seats, special meals, passengers with needs, Gold cards, silvers etc. , ability to send messages to BA, Customer relations info, incident form etc. etc. all forwarded electronically once we land.
All our manuals and countless other bits of information.
It has been a complete success and BA are rolling it out to all in charge cabin crew and now trialling it for some ground staff as well.