WT+ is pretty underwhelming if you've flown other carrier's PE products. On the 788 the IFE boxes under the seats are far too bulky and numerous and take up a lot of leg space (no idea why BA still have these on relatively new planes, don't see them on older seats on other carriers). That said it's a lot better than being down the back!

Pricing can be very good ex-EU, I've seen WT+ cheaper out of some ports than Y out of LHR. If you have any OW status then MCE seats on AA can also be a good cheap option.