An older version of this lamp didn't work for me. My brain got used to the increasing light within a week, so that I'd only wake up when the gradually amplified bird chirping got to the "screaming flock of ravens" part.
Same, I still have mine and the light itself is nice, but the light never woke me up, always the shrill / tinny sounds. I hope they've built a newer version with better speakers / sound. Still an improvement over the old clock radio though. Those things would already be improved with a gradually increasing volume over just startling you into waking up.