(shouldn't this be in SLF forum?)
Whilst not transferring, I flew from T5 for the first time last night (BA to NCL). Checkin and security very easy, and the flight left 15 minutes early.
T5 has TOOOO many shops though, and the signage is not great (toilet signs leading to a facility which looks like it has never been open, for instance).
Oh, and yes - my bags arrived on the belt in NCL! Was out of the airport before the advertised arrival time in fact (mainly due to the early departure). On the whole, quite impressed. Petty it was not that way on day 1 (or day 2, 3, 4, ...)