I spent 28 hours in Japan Airlines' business class. It wasn't the best I've tried, but I don't regret upgrading.

Source: Business Insider

All in all, I had a good experience in Japan Airlines' business class, though it wasn't quite perfect. Rachel HosieI spent about 28 hours flying in business class with Japan Airlines on my way to and from Tokyo. The seat was comfy, even after it became a lie-flat bed, and I enjoyed the in-flight meals.