Old CX J herringbone shaped coffins are quite good in flat out sleep mode (in fact, very good), but cramped and horrid in day mode sitting. Oh, and if you like to look out the window with these seats, make sure your head can rotate 120 degrees comfortably
Got to disagree on this point, the herring bone coffin is dreadful especially if you are more than 6' and bigger (wider) than average. The tapered end of the seat where the feet go is especially awful. Luckily the AVOD is quite good negating the need to look out of the windows much!