I've had it for about a month; the first one came with a problem, the second one works very well.
It's made of average quality plastic; the plastic cover for the 2032 battery scratches very easily, as if it were butter.
The plastic base comes off very easily and it sticks to the wall. The USB cable is relatively short, and we need to have a charger from those we have for our phones; nothing special, a 1A cheap one is more than enough.
There are also USB extension cables of 1.5 and 3 meters, so the cable issue is resolved.
It's very easy to program; I haven't tried its alarm clock. The LEDs are bright; when it gets dark, they automatically reduce brightness. Of course, I have manually set it to the lowest brightness; it has 3 levels, and it still looks very good. The digits are large, so you can see them easily even with myopia from 2 meters away.
I've left it on default to show the time for 10 seconds, the date and day for 3 seconds, and the temperature for 3 seconds. From what I've read, you can set it to show only the time, but I find it useful to see the temperature. Compared to the other two I had at home, they show about the same.
The good thing is that I haven't seen it lose even 1 second in a month; I placed it next to my computer clock to compare. It also uses a 2032 battery, which is included in the box, to maintain the settings in case of a power outage.
The red light is quite bright, and with the low setting, I believe the equivalent would be ideal if you search for blue LEDs on Skroutz, especially if you plan to place it in a bedroom.