I flew MAN-ORD-MAN a few weeks back in J. Was extremely impressed with the onboard service; rather less impressed with the seats, though! According to Weber (the manufacturers) bmi redesigned them somewhat ... with the result that they are narrow and have a rather truncated seat cushion (so feels like you're about to fall off). The latching mechanisms for the videos didn't work too well, either!
On both my flights, Y was packed whilst the premium cabin and J cabins were all pretty much empty.
Catering was absolutely first class; and the onboard chef was a brilliant idea!!