I got my OF-660 yesterday. All but the first two frets are flat and the action is too high for me. Couple the high action with the flat frets and it is a nightmare to play. Lots of buzzing if I don't use a massive amount of pressure because with flat frets you have to press harder than on crowned frets.
It sounds good, looks good, is the perfect size, the pick-up is really good especially for not having any tone controls, but I want to enjoy playing it and so far, no joy. In hind sight I should have kept my Voyage Air until I knew the OF-660 would be a good fit. I have to go on a trip at the end of next week and it is unlikely I will be taking the OF-660.
I will see if I can resolve the flat frets and high action because the guitar is perfect for travel, the size and scale length are a perfect compromise to my full-sized guitars.