If you're being waken up every day by unnatural means, your body is not getting enough sleep. A few months ago I threw away my alarm clock. Now I just wake up whenever my body wants to. It's been great.
That's great if your schedule fits your sleep schedule, but I'm not sure that's very common. A product that can wake you up in time for your schedule and avoid waking you in the middle of a sleep cycle could make it easier to make due with less sleep. At the extreme of little sleep required for newborn overnight feedings, for me, three hours of sleep is significantly worse than two or four. That said, sleep cycles tend to be shorter and shallower as the night goes on, after several hours of continuous sleep, the penalty for waking up at a bad point is not that bad.
A few years ago I started waking up with the sun. Since then my waking experience has been great, I get a solid 7 every night and my day doesn't start with an abrupt bell. The sun is up, so I'm up.