I've been using proton suite since the early days. I recommend giving it a try if you haven't ever, or in recent months. You aren't going to get an accurate picture from reviews here. There's so many changes recently in the past 6
months that people that stopped using it just arent experienced with. In all my history with proton, there hasn't been anything bad enough for me to switch back to non-E2E mail but it hasnt been smooth sailing the whole time. I switched from Keeper to Proton Pass and it's actually better. I was actually surprised. Good luck!