I was, then cancelled.
Pros: really enjoyed the service. Music discovery was great and it was easy to add songs I heard on their radio stations right into my collection. I found dozens of artists that i now follow and love that I never would have heard without this service.
Cons: I am very anal about my folder hierarchy, structure, and organization for my music. Like, everything consistent and perfect. Apple Music just does whatever the fuck it wants. It was like someone coming into my home and not wiping their feet on the rug. Huge strike for me. The other big issue is the file formatting. I prefer FLAC. I do not prefer Apple's formats, as they are not always compatible across devices. It's not fun when I want to use my old portable MP3 player, for example.
I'm the end, I realized that having full control of my library, file formats, and it's structure was too important to me Than the service so I cancelled. I miss the music discovery.