I know this is nit picking, but I find the seat back pockets and the tray tables to be a nuisance. I think ursine1 is correct because the tray table is noticeably higher when I try to use my computer. My butt went down and the tray stayed the same height.

And they have finally found a solution to putting anything in the seat back pocket except the WN materials already there. I like to put my mouse pad and mouse in the pocket to make it easier to get at at 10K feet. I got the pad in, but the pocket would not expand enough to put my mouse in the pocket even at the edge where there are no WN materials. Forget about sticking a water bottle or thick book in there.