Only flown on 787's twice - in 2018 we took a calculated risk and flew Norwegian from Gatwick out to Denver,Co (super cheap tickets
).The 787's were having many problems at that time esp engines so it was a risky proposition.As it happened - everything went ok,we flew out and back cattle class and the cabin/seats were 'ok' - the cabin crew were really good,iirc the food outbound was excellent but the food on the return leg was mediocre to say the least LOL.
We definitely enjoyed flying in the 'classic' 757 more than the 787.