Revolutionised my winter morning get ups! I use my phone alarm (nicer than its beeping alarm) but set the light to come up just before. Have woken up naturally and usually before my alarm, ready to get out of bed, unlike my usual snooze button presses. Lights up the room perfectly - not glaring... but enough to help with waking up and feeling far more ready to get out of bed. Have used for a week so far and made an instant difference, whether I slept well through the night or not.
Not sure why so many have complained about it being difficult to use. I use it every morning, same time, no matter if it's a day off or not. Simply press the Sun button to turn on the sunrise feature to your preset time. You have to press the Sun button every night to activate the Sunrise feature - not sure why it doesn't just stay on day after day. If the light is on when you set the sunrise feature at bedtime, the light will slowly fade out too.
If needed, the alarm time is very easy to change... by holding down the Sun button and using the '+' and '-' buttons. It is also easy enough to set with the alarm sounds with the light or not, and whether the LED time display fades out or remains on.