I have the Uniden BCD325P2 and saw that there is an optional (paid) upgrade you can get that enables the ProVoice system CODEC. Is it worth it? I do live in Denver and see that the Denver County EDACS system does seem to be one of systems that has this. Anyone do this yet and is it worth it? What would it enable me to listen to without the upgrade? I know it wouldn't be able to decode the encrypted talk groups. Am I missing out on something?