I believe the Bose interface is well worth the money. Also, the Bose A20 is significantly better than the A10. I always tell my customers to configuer the helicopter with the thought of the next buyer in mind. The 66 is now approaching $1,000,000. The buyer wants everything.
As for the floats, we have istalled six of the Dart floats on the 66. On a new ship I would probably go with the Factory option. However, the Darts have some advantages. A little lighter weaight and they are removable for a long cross country.
Florida Suncoast Helicopters