It looks high quality. It has standard volume, I haven't found if it amplifies or not, the caller hears various sounds from the environment and it does not connect to another device simultaneously.

Comfortable, convenient, especially now that the weather is getting warmer. Very good for podcasts. I use it for over 12 hours a day (without the case) and sometimes I forget that I am wearing it.

First impressions as I got them yesterday.
The headphones are open, meaning they don't go inside the ear but sit on it, close enough to hear loudly and clearly, while also hearing everything around you. Essentially, you have two small speakers very close to your ear.
They connected very easily with both the phone and the watch, and I wore them for 4 consecutive hours without being bothered at all, despite being lightweight despite their size.
For the short time I spoke on the phone, call quality was very good (but I was right next to the phone, so I can't comment on range).
I went for a run and they stayed in place without any problems, and their volume was enough for me to hear well even when crossing a busy street with motorcycles, but I had to turn it up to 90% for that.
In terms of sound quality, they are okay, I wasn't impressed but they cover my needs. Their battery supposedly lasts 12 hours, 36 with the case, but we'll see how it goes.
On the downside, the case is huge, don't expect any AirPods-type small case.