You should mod the older SSCs in order to be able to use future firmware that RJ may be creating. I recall that he stated that all future firmware will require the V3 mods, plus as stated above new pcbs will all be V3. It is a good practice to try to keep as much equipment as possible compatible. My V1's and V2's seem to work fine, but I plan to mod them all before next season. I only did one to test my abilty to do it and while that worked fine, I did not want to be making changes during the show season.