Not an owner- - having looked at other models- the seats make into kinda lumpy beds- they'll probably be fine for kids ( I saw a post where they made a pallet to fit across the 2 front seats with a pad for a bed there) I'd say the beds are about as good as most airline business class beds- just shorter so depends on the kids' size.
one thing I notice is that a bed can block the exit which can be inconvenient- and maybe a concern in an emergency. You could "fire drill" the family with the bed made up and in place.
Mike