Some of us have started adding XBee Zigbee devices to our tool kits and we're finding faulty devices and devices with poor reliability. The GE Smart Switches have beenflagged by another HE user as problematic.
I just finally received my XBee and discovered one of my Zigbee lights I've alway been looking at cock-eyed it indeed faulty. The manufacturer is sending me a free replacement.
If you're looking for a simple on/off outlet, the new IKEA Trådfri outlet works with HE and is a decent repeater for all Zigbee devices I own, including the really nice and very inexpensive Xiaomi devices, which most Zigbee repeaters are incompatible with since Xiaomi don't follow the Zigbee spec exactly. The Trådfri Outlets are not the strongest of repeaters, but the do work and they're so inexpensive, you can just buy enough to cover you home without breaking the bank.