The seats are nice. Good seat pitch, footrest which extends from the seat to the cabin floor. As others have mentioned, something like 1990s business class seats. Or if you have flown on TG AB6 J class seats, they offer the same level of comfort as those. However, if I were you, I would not pay for it. You do have priority check-in at the Y+ counter, and if I am not mistaken, lounge access. But united at half the price, I will book myself on UA, and ensure that I get a 777 on the transpacific sector, so as to enjoy the use of PTV. If you decide to go on NH discounted economy fare, be aware that only 70% mileage is given.