I just got a pair of these this weekend ($15 and buy-one/get-one 50% off at Target). Setup was no problem, they just go into pairing mode as soon as you turn them on (until they're successfully paired). I have some trouble with the iOS app, in that tapping the icon for the light turns it off, but not back on. To turn back on, I have to open the details, and move the slider back up.
The brightness curve isn't very good either, not sure if that's a software issue or hardware. It seems like anything under 150 or so is a single dimness, and anything above is near full. Part of that could be the lagginess of the interface. Also, one of the two bulbs hums when at anything less than full brightness. Haven't tried it in a different fixture yet.
Definitely looking forward to automation so I can group the two bulbs, and add a switch.