We have received some great customer feedback on Files To Go, our file share migration tool for SharePoint Online.
With large file shares, our customers often found they could not migrate all the files in one hit. Which meant they had to let their users edit documents on the file shares again otherwise they wouldn't be able to work.
But in doing that the files got out of date in SharePoint Online.
So we developed a migration re-run feature. This means you can migrate all your files up front whilst users are still working on them. Then when you are ready to switch over to SharePoint Online, just re-run the migration again to pick up only the changes.
You can request a free trial of Files To Go here.