Quickbooks Online ...anyone have good luck transferring all the data to the online version?

If you mean from QuickBooks Desktop, then no almost no one has had luck with that because the transfer is by design incomplete. Online leaves a long list of things behind - something for you to fix manually.

@Quickuser3 

What data type are you missing? For example, you cannot migrate attachments files. You can use the trial version to access your historical data for good.