nobi nobi seats are terrible. But I guess if you are young, it might be ok.

It's thinly carpeted (but without foam under pad) single person compartment with partial partitions, such there you don't have much privacy and yet you are closeted within that space. You get 1 blanket and 1 bed sheet. No pillow. And of course the compartment is super warm. It is an experience I will not endure for a 2nd time.

You can google for pictures of nobi nobi seats.