Opinions on Walker High Definition Links

I think I have become a tweaker. I tried the Walker SST silver cream and was favorably impressed. I am now thinking about the Walker HDL's and would appreciate any observations you might have on this product. Current setup includes Audio Physic Virgo II speakers, Rogue M150 amps, Camelot Uther IV DAC/Preamp, Theta Basic II transport and Tara Labs air 1 interconnects and speaker cable. I have been researching component upgrades but have not found anything exciting that doesn't require a hugh capital outlay therefore I am looking at tweaks to optimize my current system.
Thanks
Steve