Having previously cruised with Celebrity and RCL, we were keen to see how P&O compared, this was also our first cruise from a UK port.
The only thing we would suggest as an area for really improvement is the website, RCL/Celebrity is far better to use, but after that P&O really impressed. In simple summary P&O is not necessarily better than the other two in an one area but it is consistently good at everything where as Celebrity and RCL both have areas in which they excel but some real short-comings in others.
Compared to Cape Liberty in New Jersey Southampton is a joy. Clean, slick and very very well organised.
Well appointed and spacious. The wardrobe arrangement works really well.