Don had many good things to say about the EyeSend belay glasses. His bottom-line conclusion is:
"I can't say enough about these belay glasses--they are the best ones out there"
Don has a really interesting twist with his blog. He's interviewing older climbers that have spent a lifetime in the sport. It's cool to hear the perspectives of people that have climbed for 40 years.
Check out all his podcasts here: https://climbinglifer.com/