This converter is awful slow converting files. My guess this is because it converts all selected files at the same time.
Several little tests indicates when using multiple threads for encoding movies is painfully slow, compared to encoding them one by one. So if you use this converter please only convert one file and add a new file when finished.
I won't go into details about the plain unfriendly user interface. Did the developers even saw a real OS X app ?
I am trying to get a refund at the AppStore and I am going back to Handbrake and IFFmpeg.