Flexibility, ReportMiner can do an amazing variety of things with a scanned pdf. There is a definite learning curve but it does what I need and their support is excellent.
I am not an extremely technical person. I work with technology but I am not a developer. The tool is generally a little over my head but I have learned to use it and their support has been great about helping get it set up and troubleshooting issues.
Have a clear outline of what you are trying to accomplish and get it done during your trial period to be sure that it does everything you need. It is a complicated tool.
We are having the tool pick up email, download attachments, scrape order data from downloaded pdf purchase orders and output xls spreadsheets in an email back to the sender.