In my opinion, no.
I went from a Aud2 / Aud4 with hacked drivers, and honestly, It was the single biggest waste of money that I had spent for a long time. I ended up selling the X-fi and continued to use my Aud2.
I tried both via digital to my amp, and via analogue leads to try and justify the cost (although in reality, I use digital direct to the amp) and I just couldn't hear the improvements.
They did sound different, don't get me wrong, but nothing that couldn't be replicated by adjusting the settings on the equaliser.