Unacceptable that there is no charging with USB-C or at least mini-USB. Very expensive product, good quality, if I had known it had a special cable for charging I would not have chosen it.

Perfect and super comfortable for talking all day with a huge battery that lasts for days and a top-notch microphone that blocks out other environmental sounds

It is definitely not value for money, but it depends on what one is looking for.

Traditional headphones were very uncomfortable when I used them for long hours and they hurt my ears, while if the landline phone rang or someone tried to talk to me, I had to take off at least one earphone.

These specific headphones do not go inside the ears and transmit sound through vibrations of the skull bones.

Since I have connected them simultaneously to my mobile phone and computer via Bluetooth, I can wear them all day for all uses.
I use them to talk on the phone, participate in zoom/teams meetings on the computer, listen to Spotify or YouTube, etc. without any issues.

They are better in the mid-range frequencies (speech) and with a certain test, I found that I can hear up to about 16,000 Hz, but they are not ideal for music because the bass is not transmitted correctly and at those frequencies, you simply feel a strong vibration.

I have not tried other more affordable bone conducting headphones, but these ones are great for office use if you want to have constant contact with the surrounding environment.
I imagine they would be equally good for cycling or running since they do not block the ears.