[nickr]

The big thing on this device is Z-Wave implementation. Many z-wave gateways support between 15-30 different devices in the best of cases and not work properly... we support more than 1K because we use "class integration" instead "ID device identification". If your z-wave device is certified then will work... does not matter the brand (automation possibilities are unlimited)

Indeed
Too bad you rule out Zigbee..it will kind limit users choice.

Im using Phillips HUE (Zigbee) and this thing is brilliant, Siri, apple HomeKit, logitech Harmony ultimate, IFTTT channels, Loads of compatible apps, and some zillions of configurations, looking forward for Google home in the Shield.

I believe zigbee as a platform is very fragmented and there isn't a universal controller that controls all zigbee devices. One manufacturer's controller doesn't control other manufacturer's devices, etc.

Zwave is more universal on that front and there are quite a few generic controllers (usb or otherwise)

Yes Philips removed support for other ZigBee devices from their hue system a while ago.

Z wave on the other hand is very fragmented by the fact that it uses different frequencies all over the world. I can't pick up cheap US or Chinese gear.