Works great. But you should know...
Update: when you rename a file before exporting or emailing be sure to add ".pdf" to the end of the file name.
When it works it works buy most of the time "open in" and mail features dont do anything. I select the pages, hit the arrow and select the name for the document and then export and nothing happens. It doesnt bring up the list of other apps. I tries rebooting the iPad and reinstalling the app but to no avail. Same on my iPhone.
Sancochito734 about
PDF Split&Merge, v1.7.0