It's nothing more than a WinAmp skin. I tried installing it and it made me upgrade to 5.33 of WinAmp... It works, I guess. I'm not all that impressed.
You still need WinAmp to use their skin, so it's not like they're redistributing the app.
Are there any other WinAmp skins that are for-pay, though? Sorry, but I'm not about to pay $10 for a skin for a free piece of software.
Have you looked in the FAQ yet?
How about the Wiki?
Under normal circumstances, a signature would go here.