Got the DX in, and it was easy to install, and put in the front panel audio plug.
The PCI-E DX needs power though, which it comes with an included adapter.
Problem is, that the plug doesn't feel securely in place.
Apart from that, the hardware was great, it gave good sound quality, and EQ functionalities for my rig, just like the D1 did.
However, getting there was a real pain.
The software included with the DX and even the online drivers/software on ASUS's official site were shockingly bad.
I had no sound, nothing working on the Xonar utility, and often a grey screen in the utility (I'm running 64bit Win7).
Anyway - was about to give up and return this product, due to ASUS being absolutely terrible when it comes to software support, until I found the Unified software - which not only worked, but worked better than my old D1 utility.
Overall, bad software, great hardware = 4/5
Here's my unboxing and overview and software installation:
Here's my C-Panel Audio configurations (as requested):