I recommend it. Been using it for almost 3, maybe 4 years now? I also use their VPN service and don't really have any major red flags.

The only real issue I have is the fact that it's not the most friendly when it comes to collaborating with other email services. at the moment I use proton for my software dev portfolio mainly, and have my work/student/personal emails set up thru the Outlook 2019 app, not by choice but because of technical limitations. Last I checked, in order to get proton to play nice with that, you need an extra application (that you get from their paid tier) to run in the background of your PC at all times to get it to work, and even that's finnicky at times. If you don't mind being limited to their webapp/mobile app, it's fine tho.