I flew AC's latest J product a few months ago in their 788. i found the seat (in sitting position) to be very comfortable. very little stowage for your stuff though. i didn't find the bed to be super comfortable in its flat position though and i found the foot-well to be a bit restrictive. it was a west-bound flight from FRA-YYC so a daytime flight. food was good and i just had a single glass of red wine which was passable. the crew were excellent.
I've never flown their "classic pod" in J though but i will in a few weeks.
i find lufthansa's J bed to be more comfortable but it's not great if you are travelling alone and don't know your seat mate which is where the window seats in CW shine especially since east-bound i tend to go to sleep as soon as possible skipping what BA calls dinner.