I think it has to be the best low cost airline, if not simply the best airline in the world!
I flew with them only once so I may have go lucky, flying between Tokyo and Sapporo, but the place had features I never seen before.
First, ALL the seats were Business type, meaning large with huge room for your legs, like a business seat of ANA (used them once for the same Tokyo - Sapporo).
That was already pretty cool itself but then you fast realized the place had full free WIFI, wth!
And this for about USD 150 go and back!
Once again it seemed to good to be true so I don't know if you can expect the same on every of their planes but this was for me the best airline experience ever!