" Zigbee are "better" technically - but they are 50-100 per socket vs 10-20. "
Again - way off base here - please do your homework. A plug-in on-off socket can be had for under $30 (http://www.ebay.com/itm/Wayne-Dalton-HA-02WD-Wireless-Small-...). The cheap 433MHz argument goes out the window very quickly if you know what you're doing.
I've said it multiple times in this thread - you get what you pay for. The 433MHz (not Mhz) gear is non-mesh. If you don't currently have home automation I wouldn't expect someone to realize how much of a key this is to a reliable and useful system. But, go ahead - try running more than a dozen 433MHz devices on a controller - it's going to be unreliable and have restrictions based on proximity to the controller which will depend on the NinjaBlocks RF design as well of each of the individual plugs RF design. For $3, I bet it's stellar!
Again - way off base here - please do your homework. A plug-in on-off socket can be had for under $30 (http://www.ebay.com/itm/Wayne-Dalton-HA-02WD-Wireless-Small-...). The cheap 433MHz argument goes out the window very quickly if you know what you're doing.