I have a protonmail premium account and I'm disappointed. First you can't use a native client in linux because the bridge isn't released yet (in the faq it's written it's planned to be released early 2018 lol). The android client doesn't like the fact that I desactived the google play service on my phone (how can a privacy focused email depends of the google play service? ). They hooked me up because they said that they where going to open sourcing protonmail, but for the moment neither the bridge nor the android/ios client are open source.
The bridge solution is a nice attempt at supporting open standards, but it's not on Linux or Android which basically means my email is silo-ed. I can't use it with my regular mail client and the ProtonMail client will never be all things to everybody.
The android client at least does seem to run just fine without Play Services, it just pops up annoying notifications saying it needs them.
At this stage I'm probably looking at migrating away.
I'd really like a mail provider that lets me forward a few addresses to the rest of my family since I own lastname.nz, but that doesn't seem possible on most mail hosts without a full x-user enterprise setup.
