I can't comment on MH because I don't use that. For UPB, if you outfit most of your house with UPB switches, you should consider getting two PIM's. Keep one for programming, testing, and as a backup and leave the other attached to the RPi. I've seen used PIM's go for $25 and new ones for $50 on ebay. You may also want to search for "UPB starter kits". You can get a PIM, signal bridge, a couple of switches and a scene controller for a reduced price.