Just flew ORD-LHR; LHR-ORD in the 787-9P MCE.

Out bound my wife and I were in 20D/E. These seats are wonderful. They are bulkhead seats so maximum leg room. The bulkhead does not extend all the way to the floor so yo are able to put items (back pack, etc) under the seat in front of you making this a "full value" seat.
Screen is mounted, folded down next to seat, but there is less intrusion to seat width than I expected.
Proximity to lavs is a benefit to me at 72 with old man bladder .

Inbound we had 21 B/C and these were almost identical with only maybe slightly less leg room but otherwise all of the above comments apply.

For $1000 a piece RT RST-LHR you just could not do much better (Unless our upgrades to J had come through).

All the best.