The googlecloud voices are pretty good, but they don't play well with VPN (I have to update their permissions at least once per day). So be prepared for choppy robot voices, or having to do extra steps to use the add on every day.

It would also be nice if instead of having a separate popout window, it just highlighted the word it was reading on the webpage itself, with just pause/play and skip buttons. (Even better if I could click on the page and play from there instead of having to skip a bunch of the content to find where I want to resume listening)

All of that said, the add-on does read the pages for me, and once I confirm I'm not a robot the google voices are great.