Note that I have confirmed that the SRS version of the driver works, it's just the Beats version that doesn't. i.e. I used another HP laptop (an Elitebook 8560w) - it's a "business" model so it comes with the SRS branded stuff not Beats Audio (but they are essentially the same).
The point is that you can disable SRS - and the headphone audio is good, if you turn it on it is "enhanced" and has poor seperation - I get that the enhancements might be desirable for some users, but it's also essential that you can turn them off too.