I am a ten year Lancair pilot having owned almost every flying model except a Legacy (bought a Legacy kit from Lancair in 2000 but never flew it) but I am seriously considering the purchase of a flying Legacy.  There are some very, very nice airplanes out there but I have a concern on the avionics side of things.  Many of these airplanes have Cheltons installed.  I have never flown with Cheltons but have heard very good things about them.  My concern is that they are what they are today with no chance of a path to the future. There are a couple of Legacy airplanes for sale that I would like to pursue but the Chelton thing tells me not to go there.  I would appreciate comments regarding this dilemma.  Should I feel this way?