The real win for me is being able to work outside in full sunlight, without having to care about screen glare. I have used them in the office and in coffee shops but that's almost incidental.
Chairlift at ski hill. You're on it most of the ski day. I've done the math with Strava and a typical day has me on snow for less than half an hour lift and lodge are the rest. I used to study on chairlift during university with just a bunch of paper.
