Posted the job ad two weeks ago about this.
Am currently on the scheme. Not bad going. Had a few problems with it at the start but quite enjoying it now. It did Have teething troubles like every new start up course but things are improving with the new manager that came in after xmas. Have to agree with the people that are disgruntled with BA management and their attitudes to BA, we've had experience of it too! But from what I've read from other airline forums, BA isn't the only airline that treats engineers this way.
At the end of the day, take what you can out of the course, they're paying you to get your licence which, if you look about ain't cheap to get. At the end of the day, when the little CAA book pops through your letter box at the end of the 4 years, you can hand your notice in and go elsewhere if you wish.
Good luck to all those who apply. Hopefully might see some of you at the interviews (I'll be there for the free food if they still have it!)