Ask HN: What's your iPhone Duo experience so far?

I assume some of you bought it on release. What are your thoughts so far? Would you recommend it to casual users? Did you return it, and if yes why? Just interested to learn a bit how people who aren’t pro-reviewers feel about it now that it has been out a few days.

Also, what’s the most interesting, creative use of the foldable form factor you’ve seen?