Switched to Airtronics from Kraft in 1989. Still using 2 old Vanguards for trainers, and they have been crashed a number of times, never requiring more than minor repairs. Airtronics service is FAST, cheap and courteous. I am also very happy with my RD-6000 which I use for 4 different models. In my opinion it's computer has programming features superior to the 6XA. I did play with a 6XA before buying the RD6000

But it is a Ford/Chevy thing.