Granted I don't know a ton about Zigbee other than it's the approved wireless standard for BACnet, but I'm glad to see comments like this. It's seemed silly to me that all of this home automation stuff gets marketed as new and revolutionary when it's just balkanized and proprietary implementations of technology that's been in commercial buildings for decades. BACnet seems to have become the defacto standard in serious building automation. It's ridiculous that this home automation market seems to ignore a tried and true open standard for all this proprietary nonsense.