I would avoid this aircraft at all cost on long flights. I was on a Yul -yyz run yesterday in j class and fa's we're complaining about it. Seat 2a when reclined feels like the lower half of your body is in a coffin. Also be very careful when deploying the table tray, it shoots out very fast, and comes close to hitting the passenger. I walked back to prem y and y, it looks very cramped in y. It's fine for short flights,actually prefer j for short flights, but would not want to try and slept in those j seats. Lavs in j are better however, hopefully this configuration will not be repeated in the future.