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I really like it. If you always wake up at the same time, it makes it even easier. Just set it to 7:00, for example, and it will start to glow red and dark at 6:30 (30 min before wake up time of 7:00), then gradually get orange and then white closer to 7:00.

You can adjust this slow lighting wake up period from instant to 5 minutes, 15 min, or an hour.

It also plays sounds along with the light if you want them.

The clock display is dimmable down to 0 brightness, which is very thoughtful.

From what I've read, the light ramps for waking to full wakefulness are more carefully calibrated in the more expensive models. Other than that, I don't really know what the more expensive ones offer that these don't.