Writing, reading. How big is the screen? About the size of the small ipod?
It’s a watch. Screen is about 1”. Don’t expect a dense complex UI ... but that doesn’t mean it’s impossible to use. You likely won’t be reading/writing long emails, but certainly can read the heading and decide whether pulling out the phone is worthwhile, or deciding that a quick voice/dictated response is appropriate. I had no problem reading it. Your vision may vary.