So, here's the thing about this software...if their measurements are accurate, and if the corrections are implemented correctly (two very big IFs), then I would say the software is about 50% successful. I have six sets of headphones/earphones that are in the software's list of those measured and corrected. The three lower-end models are very slightly improved, and the three upper-end ones are made much worse. The three that are slightly improved, while more even overall, suffer from too much correction and sound "off". Flatter, certainly, but also somewhat less natural. If you are adept at using APO equalization software, the same results can be had for free.