Awkward, with some problems
You cant open files with a .xml extension using the "File->Open" menu option. I dont have a clue what extension its looking for, but .xml would seem an obvious one for an XML editor. You have to either type the name in the address bar or drag and drop the file from the finder.
It formats the XML in a downright strange way. It inserts newlines before and after the content of elements, obscuring whether there really are newlines or not. And it makes it hard to read.
The "File->Open Recent" menu option is always empty, and does not list the files Ive opened recently.
The app isnt very fancy, and I could probably hack out one better than this in a day of work. I would expect more from a paid app.
Steve 3000 about Visual XML