Thank you! The extra space was nice, especially the additional recline, the catering I cannot comment on as I slept through the meals, and as for "everything" else, what else is there really? The loo was clean, too, though I did not compare it with the proper Y bathroom...

Would I pay for it over Y? Only if the fare was 10-25% higher than Y, more than that and I might feel that there is not enough value added for the premium charged. Or if my chances to be op-up'ed to J would seem pretty high!