Lifetime: 1 ½ months

Initial Comment:
As already reported several commentators, readability is not excellent when not perfectly in front of the screen, and the keys are not immediately identifiable by touch. As for me, I do not find those two little really annoying flaws.

The double ring is very convenient when you do not rise both at the same time (or if one wishes merely the lazy mornings of the weekend without the risk of forgetting to adjust the alarm time on Sunday evening. ..)
I do not find it to be more complex than most other devices of this kind that I know.

Update 2 May 2013:
The alarm clock suddenly stopped working that night: all display segments are lit (it is not a battery problem) and no commands have any effect. Casually, impeccable reliability is IMPORTANT to feature an alarm clock, because the consequences of this kind of betrayal can be quite severe.