I got them so I could listen to audio books without actually ignoring my kid, who was 3 at the time. Couldn't not hear her world if she decided to get up to something. 10/10 for that.
I also loved them being hidden under my hair. Its rude to have headphones in a conversation, but this isn't rude, with them silent I can hear as well as without headphones.
Aa for dual-pairing, I had your same issue with shokz, but I found out it was Windows with the issue. Shokz switches based on who it hears playing audio and Windows likes to keep "playing" audio at 0 volume instead of properly not sending audio. It's an issue that's pretty irrelevant for most things, but it means Shokz never feels that there's only one audio source at a time, after its connected to a windows computer once. They worked fine when I paired them to my android phone and an iPad to test things.