If you can get yourself a seat in the mini Y cabin and you are not a 6ft 6", 20st man mountain then might not be worth it. Although I am neither of those and I would prefer to pay to travel WT+ than WT.
Been checking for WT+ POU on my upcoming flight, sadly it is now only offering upgrades from WT - F for £4900. No sign of POU and a full WT+ cabin when trying a dummy booking. Still I am in 35D in the mini Y cabin.