General rate: Negative
It works to merge MP3 files, BUT with one GLARING error.... The merged file has the same length as the first file in the group. When being played back in a media player, the slide bar is only as long as the first file. You can't fast forward or skip beyond that. Also, the program operates in a rather small window that can't be Maximized or stretched. I tried the evaluation version of Direct MP3 joiner, and it was about the same speed, BUT without any of the problems noted above. Now to call my credit card company and dispute the $20 that I paid for the junky Twins File Merger.