AV Linux is terrific if you want to do multimedia production. In particular it gets all the OS settings right for real time work, which many other Linux distributions don't (you can make the necessary adjustments yourself but it's a pain because it's an area where each distro seems to be slightly different). You need real time for Jack, which in turn you need for glueing all your audio processing software together.

I do occasionally use my studio computer for Desktop stype stuff (it has Libre Office, web browsers, email etc.) but I wouldn't heartily recommend it for general desktop use, nor even would Glen MacArthur who created the system. For one thing, you are somewhat limited in what additional packages you can install without breaking dependencies.