So, the main cons:
1. It has no backup battery and if the power flickers for a half a second your settings are gone. You can easily miss work. I'm still thinking about a solution to create my own power backup.
2. The main problem that other customers seem to have, just like me, is that there is no adjustment for the piercing beeping volume. That is horror. Like everyone else, I tried muffling it with cloth, tape etc. but that didn't really work and I found a better solution (there is another customer who completely removed the speaker but I need it, just in low volume):
- this clock has a simple piezo speaker (see video and pics), which means that the sound is coming out of a very small hole.
- Instead of covering the whole clock with a scarf of pads or whatever I and other people used, I decided to "kill the sound" as it exits the speaker, at the source.
- Thus, I used a dremel (anything else can be used - a hot knife etc - be creative!) and cut a round hole around the speaker. The risk of touching other electronics is very small, as there is a good gap between the cover that you are cutting and the electronic board. Be careful, though.
- As you can hear in the video, by covering the speaker with your finger the sound decreases by 60-70%.
- I covered the speaker with a small but thick piece of rubber (you need mass to block sound, anything thick and dense will work, not cloth or cotton or fluffy stuff) and you can easily apply a sticker to cover the hole you just made.
There's also someone on Youtube who took the whole thing apart if you're interested - https://www.youtube.com/watch?v=Gyd0_qAeUqA
If I find a cheap easy solution for the backup battery I'll make sure to post it here.