Unlike last time, no coupon code is required.
I purchased four last time, and later added a gateway, wireless switches and a human body sensor (from Gearbest though). I'm getting one more bulb for now to change out my outside light, and I'll be pairing the human body sensor to turn on the light when I come home at night, and turn the light off if it doesn't detect motion for 5 minutes.
They work really nicely, I find they're bright enough (for me), and with the gateway, I can use the switches to control the bulbs without having to pull out my phone. After some issues setting up via my Android phone, I was able to easily set them up with my iPad.
Cheap, good entry level for smart home automation, just no IFTTT support.
Is the gateway and motion sensor reliable?