The distance between seats the times that I have flown were very tight. Don't think about using a laptop unless you are in a bulkhead seat or have an empty seat next to you and can turn sideways. (They do have power ports through about row 23.)
It is better to restrict your reading material to paperback books; it is hard to read a fullsized book once the person in front of you reclines their seat.
I sugget that you politely ask the person in front of you to warn you before reclining the seat to give you a chance to arrange your legs.
I was pleased enough with the service and food.
In contrast to marginal accomidations in coach, Business/First is fantastic.
There is no President's Club and the NW World Club is in the other terminal. Bus service between the two terminals is not real frequent.
If you end up with some extra time, the little town of Narita, just a few miles away, is quite nice.