As a long time ProtonMail user, I only use their mail service. I don’t particularly like the idea of one company being a singular point of failure for my data… Proton is good, certainly better than Google, but putting all your eggs in one basket seems like a bad plan.

I also discovered the hard way how the services interact with each other. I had the free email and chose to test out the paid VPN on the same account. The paid VPN pulled money out of a masked debit card before starting the service, just like any other prepaid service. I disabled the debit card, and Proton attempted to charge me for a second month of VPN service, failed, and locked me out of my email. I had to prepay for a second, unwanted month of VPN service before it let me access my mail again.

I really like their VPN, in fact, I put my entire home network behind Proton VPN. I also use Proton Calendar for shared calendars, for my personal stuff I use a self-hosted solution. Sometimes I upload something to Proton Drive. But probably the most useful Proton product (other than Mail) is SimpleLogin which you also get Premium access to when you subscribe to a paid Proton plan. It allows you to generate an unlimited amount of alias email addresses and all messages are forwarded to your inbox, it’s awesome, I love it.

Not the same guy, but i do use protons services. I like the seamless integration of simplelogin for burner mails that you can also answer with from your proton inbox, VPN across multiple devices (work well on android and windows, but the linux client is severely lacking), the calender is basic but has the functionality i want from a calendar, proton password manager integrates well with mail/simplelogin so you can create aliases and logins seamlessly. Their Drive solution i dont use much since it’s all manual backup at the moment.

If you want an easy one-stop solution that works generally well with no tinkering, I’d say it’s worth it.