they are perfect for a very limited trips
IF you do a lot overnight trips, with 4 family or associated persons, then they have a use.
But do take up a lot of the 550 baggage bay, and all of the baggage on 450 bay when Sat TV box fitted.
So as mentioned they end up living in the store room.
Only if you do a lot of NIGHT OUT and NIGHT BACK, and prep the aircraft and passengers accordingly. Then they have benefits.
Glf