I have one of the first 6500s and have enjoyed it everyday it is an outstanding radio. I have not had any of the issues I see posted. I am some what old fashion have enjoyed using all of the digital mods with a signalink USB with no problems. I tried the dax setups and fine them unstable and unreliable as they interface with other sofware platforms. I also have used DDU to interface with my ALS1306 and KPA500 again it works but not reliable. My question is why is there not a hard wire connection for amplafiers and other devices the other radio manufactures offer I would think this would be somthing standard. Again I have enjoyed all of my Flex Radios from the 1500 through the 5000 and now the 6500. I don't understand the reasoning why this feature is not offered and you must use 3 party interfacing software.