I had the chance to fly JAL domestic first class twice on the HND-ITAMI route. They are award tickets that I upgraded for about $ 50 dollars. I would have paid the full $ 400 fare though.

Some of the best flights I have ever taken. In both cases wide body planes, massive recliner seats with full meal and bar service with two choices of meals and two flight attendants to serve eight passengers. We also get a personal greeting from the service director and access to a decent lounge in both airports.

Totally worth it! You'll never see that kind of first class service on a flight from New York to Cleveland!