For me its not realizing that my email aliases will stop working if I stop paying. Wish I would have just went with simplelogin

You can always manually share .ics files in emails to share calendar events. I've never used Proton, but I'd be shocked if their calendar can't ics export. I think that's literally how Outlook actually implements that, so it should "just work."

I’m in the process of switching to Proton too. I just opened the account; haven’t taken additional steps of switching login emails associated with all of my other accounts, yet. I’ll probably start with giving the new account to local grassroots organizations, first.

I’d like to learn more about what people have to say too!

• The Android widget (not app just the widget) does not have a monthly view.
• There is no office suite (I don't know why this surprised me but it did).

Generally it's been an overall positive experience.

I only ever used Proton for a few secondary email accounts (compartmentalizing between personal and online) and I started transitioning shortly before they got in the news for statements.

My main problem was that I realized that I couldn't use email forwarding (or at least without paying for a plan, I forget), and I couldn't manually handle it with a third-party client without paying for their bridge, so unless I wanted to have to open and log in to an old email address for the rest of my life, I basically had to pay to deprecate an email address or move to another provider without risking any future emails to the protonmail address being lost, and I wasn't in a position where paying was an option for those addresses. Now I only register single-use throwaways on Protonmail (despite their efforts to detect and stop it).

ProtonMail works great, and ProtonDrive functions well on both the web and Android. However, keep in mind that upload speeds are slow, at around 4 MB/s, and there is no 'export all' function. The photo backup feature in the Android app works fine for me. As far as I know, the non-profit that owns the majority of the company has three owners. One of them is Andy the CEO. I don't know the political views of the others. The ProtonDrive UI feels sluggish because the decryption process. But all in all, I am satisfied.

I looked to see if I could get by replacing Photos with Drive in Proton. Whilst I can upload stuff. Videos greater than 100mb need to be downloaded to be watched. I guess because Google process videos to allow them to be streamed. Sadly a deal breaker for me :(

I feel like the Android client for ProtonMail is really slow. Switching folders is painful.

I also tried sharing calendars with my wife who is still on Gmail and didn't have great luck there. I decided I'll just forward invites to events to her, though I haven't had a chance to test that.

Proton bridge is scam - it only pretends that it works. I have been trying to get a support that it doesn't sync & delete e-mails correctly for 2 years and the only "help" was to clean the cache and wait 2 hours for resyncing...