I've been using ProtonMail and ProtonVPN for over a year, paid subscription. Both web and mobile client is ok, not great. On desktop I use Outlook (Windows) and Thunderbird (Linux). I like the domain @pm.me.

Overall happy with the service. Customer support has answered questions competently.

Protonmail has a huge gap between promises and what's delivered. Their IMAP bridge is slow and buggy, their mobile app hasn't been meaningfully updated in a year, and even as a paying user they put upsell ads in the sidebar, above your own folders.

If PM is not a honeypot, they are incompetent.