Works.

The basic function of this plugin works just fine; the music player *works*, and it works on every platform I’ve tested it on. The interface is a little clunky and old, but as long as it’s me and not one of my clients trying to set it up and use it, it’s fine. It would be good if it were better integrated with the WP media handler.

I made my own button image files a few years ago and continue to use them, because the buttons that come with the player are unacceptably rough. Why has no one ever fixed this simple thing?

Update 1 Mar 2015
Yes, I have been using this plugin for something like five years now. There’s really not anything out there that replaces it.

The developer recently did a big overhaul of the plugin; I haven’t had time to check out the integration with the media library, but it appears to have been improved. And the styling interface is pretty nice. Those ugly old buttons are gone. I have bumped my rating up to five stars. I would hate to run a musician or venue’s website without this one.