I've been using this as one of several tools (noise gate in Audacity, The Levelator) to increase the audio quality in my podcast. Subjectively, I think it's been working, and I love the simplicity of the interface. No tuning, just trust the AI. It works well for standard spoken English, but will do some horrible things to music (it won't detect music and be like "hey don't do anything to this"). So you shouldn't run it on a file that includes both music and voice.