What do you like best?
I can easily reverse a song, simple to make changes in bulk, the possibility to add tags and album cover, useful effects, a detailed API and fast for quick edits.
What do you dislike?
You need experience with Python, or you'll get confused, some results are hard to achieve, depending on how you run your script, FFmpeg keeps popping, which can be a nuisance.
Recommendations to others considering the product
If you have an effect you constantly apply to your songs or need to make a quick fix, I recommend PyDub. It's hard in the beginning, but after you get familiar with the module, you'll be able to apply the effect in a few clicks.
What business problems are you solving with the product? What benefits have you realized?
I use when I need to match the length of music with video, add fade-in, fade-out, and silence to the beginning. It's perfect for quick fixes and edits for instructional videos.