Have not purched DMR yet. So you do recommend that I get it when i do get the new up and running? Thanks.If you purchased the DMR upgrade for the SDS100, make sure you leave a note taped to the scanner. If you return the SDS100 and replace it with a SDS200, make sure Uniden is aware that the SDS100 had the DMR upgrade so they can make it right with the SDS200. Different scanners require different upgrade keys.