Just flew the 787 PHL>LHR. I paid for the upgrade to premium economy on the outbound but sat in the back for the return. I have to say that I think it was worth paying for the extra leg room. The legroom in econ was pretty disappointing for my 6'2" body.
Things I like about the 787? Big windows and electronic shades are cool. IFE with 2 USB charging ports are a bonus. Otherwise, it seems pretty much the same as the other jets.
I went to book the same flight for November and noticed that they've replaced the 787 with a 767. I'm assuming this is a temporary or seasonal change. Does anyone know if and/or when the 787 will be back on this route?