Had booked this trip back in the Spring as required both these dates (in school holiday) and a 4 berth cabin. (Though as an aside, we came across fellow passengers who paid far less than us by booking at the last minute Getaway fares offered by Cunard, so could probably have got two balcony cabins for less than the price of our standard 4 berth outside if we'd risked waiting...)
Had never done a Transatlantic before (previous cruises have been to the Med and to Norway) but we always loved the sea days so 7 days without a stop didn't faze us.
Embarkation at Southampton took about an hour from arriving to get on the ship, with most of that time waiting in the very long queue to actually check in. But once through Security we were straight onto the ship which was great.
Reasonably large outside cabin. Has bunks that can pull down if 4 travelling.
Right at front of ship so will feel motion in rough weather.
Very handy for forward lifts/stairs though. If you don't need balcony (eg Winter Transatlantic crossing) then I would recommend.