How dare you forget about the Twin Rotors. They were 25 years ahead of their time, and nobody has equaled it yet! Just about the time someone thinks they've equalled the TR, all they have is problems. I'm happy to report a TR-96 with 1700 hours had one lifetime breakdown. Our TR-98 has had only one problem, that was because the dealer or factory didn't have a belt running straight and it broke a belt and bent a shield. Took a meer 30 minutes to fix. Not bad for 900 hours already. A 9600 several years ago was constantly replacing bearings @ 800 hours. Told us happens all the time. At least they got good at replacing bearings. Don't overlook a TR.