Some people are, but not much is being distributed yet since the player is still in beta.
Render times for straight audio aren't bad at all - faster than realtime on a fast machine. And it does what is promsed - six discreet channels. A supported sound card is required, but there are a number of those.
My Book:
http://www.benwaggoner.com/books.htm
Cleaner e-book:
http://www.ebooktech.com/shopping/shopexd.asp?id=279
Cleaner Tutorial:
http://www.saferseas.com/navseries/adclean.html