Not throwing stones, but correct me if I'm wrong. It seems that GRE is no longer supporting the PSR 500 or 600 with software updates. They seem to concentrating their efforts on the PSR 800. I know it's may choice, but I refuse to purchase the 800 as I still like to program my radios the 'old fashioned' way so that they're set up the way I want. That being said, I'm still a big GRE fan.