I have seen a druid and a wizard use one once. Didn't impress me much though. I felt like it gave them only a slight advantage in downtime over not having it. Like. 5% less downtime. Just how much it felt different with them in the group vs someone without a manastone. I feel like it was more a peace of mind thing or something to help with an obsessive compulsion to be "doing something".
I had a cleric friend who bought one eventually, but I outleveled them by being clever long before they bought the stone.
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