We used to be fan of Intercom. We're now still using Intercom for our non-profit but will have to change soon. Their support is really slow and inflexible. They change pricing from a day to the other without consideration.
So be mindful, they have no consideration for their users, it's just really about money!
EDIT: No one from their team ever reached out (obviously)
Recently we've also had more issues with them (pricing changing with no warnings,...)