Ive used it and love it. I convert PDFs I read for work to ebooks and then audiobooks. Then I listen to the content at the gym and count it as work hours :)
Nothing beats a good narrator, there will always be a place for performance and folly noise. This is a useful tool for the content you have to consume
I love them in the summer. They are refreshing.
I really like tacking a pack of la Croix (or kombutcha) to a party or BBQ. I can chug through them like beer and be a responsible human at the end of the event. That no calorie and not artificial shit is a big big plus