This controller came with a used Choptima I purchased this year. I upgraded to the Petrel 3 and really do not need an extra controller. This would work excellent as a primary or backup controller for either flavor of the O2ptima. It has 5 hours of use. I believe the person who owned this before me just took the class and never used it again. I could imagine someone going on a big expensive trip could use a backup just in case. Remember, calibration is stored on the board, so if your primary controller fails, you can just plug this one in and continue mission. No OCONUS buyers. $20 shipping. $750 OBO.
