I've been on the Proton premium plan for about a year and a half and love it.
I mostly use it for Email and the VPN, but I do use Proton drive for some random stuff.
I don't use Proton Pass because I already use Bitwarden for all my PW management needs.
Email and calendar services have been pretty much flawless so far. I like the interface, the Proton mail bridge works well for desktop clients like Thunderbird if you want to use those. The apps work really well on my Android device, all of them, Calendar, Mail, and VPN.
My torrent box Proton VPN CLI app has been solid too.