There's a YouTube video someone linked in the Computer Audio section that I can't seem to find, where it showed exactly what ticking on and off that Beats Audio checkbox in the interface actually does.
Now, in the sound control panel, there's a rudimentary EQ with bass and treble sliders that most people aren't going to notice. When you click on the Beats Audio checkbox, those shoot to +4 bass and +4 treble, despite the EQ in the Beats Audio interface supposedly being flat.
The nasty part, though? Check off the Beats Audio checkbox, and the driver EQ settings suddenly get skewed to a massive -12 to bass while treble remains at +4. That's right, they try to make it sound WORSE with it off so that you think it's better with it on!
I just hope they've improved the analog circuitry, at least. Most of the time, it's a bit of an afterthought on computers, with lots of hiss and noise, though on my HP EliteBook 2730p (a business-class machine with no frills as far as audio goes), the output is surprisingly clean with none of the noise that plagues most desktop motherboards regarding integrated sound output...