We had 4tb of on Prem Enterprise Vault data, that we wanted to migrate back into 180 users mailboxes, now stored in Microsoft 365 exchange cloud. We wanted a solution which will take the data for us, move back to the same location as the vault stub, and remove the stub when complete.
Archive Shuttle was the product which did exactly that, and more. It was easy to install and setup, with the assistance of the consultant and at that point, our involvement was to supply a list of names which then just migrated at a good pace with no impact to our network or users. The process was invisible to our users.
We only encountered one issue during the process which was archived messages which had not been read, but had a read receipt request against them, fired off Not Read read receipts as the stubs were deleted. Some of these messages were years old, which would have caused confusion, but the pilot mailboxes highlighted this and a quick transport rule stopped them going out. Not a problem. Review collected by and hosted on G2.com.