This must integrate with Proton's appointment scheduling feature, no? That's a feature offered as part of their Workplace Standard and Workplace Premium plans. Does anyone have experience with that feature? How does it compare to the Microsoft Office 365 bookings feature? Honestly couldn't do my job without something like this manage my stacked schedule.

We at Sourcemeta (https://www.sourcemeta.com) are in the Proton business plan. The "Talk to an expert" and "Schedule Consultation" buttons in the main page point to my (the founder) calendar to book a slot.

No complains from it so far. People get it, book with success, and I run those calls on Proton Meet, which also proved to work pretty well.