I'm in a similar boat. I have a URC MX-980 w/ MSC-400 that has served me well and I continue to maintain with the URC official access for end users to legacy products, but I'm thinking of upgrading some components to devices that are IP-enabled / Bluetooth while I still have some legacy devices that I'd like to continue using RS-232 on. I really want something that I can continue to tweak and maintain myself which makes any pro-installer-only options a non-starter but it seems like those companies are the only ones that make products that can do what I need. I really don't want something that I need to rely on someone else to make changes on, but I can't find any products that can do what I need and I can program myself. 🙁