Not surprisingly, I chose this clock for 3 reasons: it sets itself, it projects the time on the ceiling/wall, and it's quite inexpensive. After a needlessly painful setup (more on that later) it set its own time, and the time projected on the ceiling is easy to read with my glasses on (just barely readable w/o glasses).
The first problem I encountered was plugging the power supply into the clock. It uses a standard coaxial DC power connector that plugs into a socket on the bottom of the clock. Unfortunately, the hole through which you access the socket is not only much larger than the socket, but so much larger than the socket housing (a box containing the socket connector) that unless you have sharp eyes and carefully align the plug with the socket, the plug will slip into the gap between the socket housing and the hole in the clock case.
After getting the power connected, I left for work, and when I returned, the clock showed the correct time--only off by 3 hours. OK, so I needed to set the time zone. There are no buttons labeled "time zone", "TZ" or anything similar. A quick check of the manual (don't lose that manual!) revealed an unintuitive process for setting the time zone (typical of devices that don't have enough buttons):
1. Hold down the "Mode" button for 3 seconds. The currently selected time zone will be displayed.
2. Click the "Mode" button until your time zone appears.
3. Click the "Snooze" button.
Despite its poor design features, this clock basically works as advertised and is inexpensive. Since most of the time, you won't need to touch it, if you can read relatively dim, red 3" numbers on your ceiling, then it's probably a good choice. Just don't lose the manual!