In the dark winter months, a great help. Come so better get out of bed. Will usually already slightly awake when the "sun begins to be working." ;-) For me there are two disadvantages: 1. The lamp is half an hour before the set travel time slowly (that's good), but the current radio to turn on until the alarm time. I think it would be nicer if it concerns more. 2. The snooze function (via light touching lamp) sometimes enabled to already, by slight vibration, z. B. if you only what lays on the nightstand.
