As others have written, the seats are great for your long LAX-LHR journey. The hard product is the attraction here.

I've flown in the PE cabin HKG-LAX, and PE passengers freely used the toilets near your seats.

As for service, you'll be regularly reminded that you are in Coach. That reminder will come in the form of being ignored for hours at a time.

For that bulkhead seat, I recommend you get onboard early. Overhead bin space goes fast in that PE cabin, and all of your luggage has to go into the bin for takeoff and landing.