I had a flight cancellation and instead of flying HNL-NRT-SIN, I am now flying HNL-SFO-SIN. I managed to get an upgrade to E+ which now shows a seat upgrade possibility for the 16h flight from SFO-SIN to Premium Plus for $287/person. I remember checking upgrade options on my previous award flight and this seems like a good deal, but just wanted to see what others thought. Have never flown Premium Plus before.