Originally Posted by kazuwox

As per upgrade point, it is NOT very useful for passenger living in Japan.
If your point of dept is Japan, booking class eligible for upgrade Eco-> Biz is "Y/B/E" only
and most of the time airfare is somewhat ridiculous.
That's why lots of Jp people complained about this. Consequently, they're forced to use
their points for domestic flight upgrade (Premius class).

While your itinerary starts outside of Japan, eligible booking class is more reasobale ; Y/E/B/M/U/H-class.

Hope this comment wouldnt discourage your thoughts onto NH.