In my case, I am running Homeseer plug-ins for my DSC alarm, some one-wire thermometers, and a Brultech energy monitor system, so I will keep it for those. I've been told there are some Insteon functions HS can perform that the ISY can't, but I doubt I will need them. At this point, I just want to keep the HS PLC as a backup at least until I am sure the ISY is configured correctly.