I've been having a lot of fun with the last couple of versions. It's an idea I haven't come across before, and I hope it gets further attention from the developer.

The interface isn't immediately intutitve, but it's good once you have it figured out. The application's help webpage covers it well. I'd like to see more sophisticated controls.

I've been using it with iTunes playlists for background audio while I work, and it's been solid.