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Just looked at their pricing and it looks quite sane. How good is their calendar and does it sync to iOS and Android?

Their Calendar is exactly like any other caldav icalendar, works fine on iOS and any other platform using the calendar standard protocol.

Been using Zoho for many years, switched from my free grandfathered Google Apps account to Zoho around 2014.

I use the Zoho app (iOS and Android) for mail and calendar, so yeah, it syncs that way. I haven't tried setting up another mobile app.