I had the pleasure of flying this bird LHR-LAX on Fri the 13th and it is nothing short of amazing. From row 7 the front cabin feels incredibly spacious, the new IFE software is much smoother, and the 787 layout feels better than the 77L with regard to galley and lav spacing. Obviously the one complaint is the loss of the oversize 2L lav but the others were never busy on what was a full flight before the border cutoff. I didn't go back into coach at all but can say in regards to the J cabin it's really an exceptional bird, kudos United.