We use Redtail for our CRM but haven't had a great experience with Redtail's calendar. It's onerous to update, slow to load, and doesn't integrate well with Google calendar or Calendly. When we receive invites (outside of the meetings scheduled using our Calendly account) we have to manually add them to Redtail.
I'm curious if other Redtail users are experiencing the same issues. If your firm uses an alternative calendar, please share.