Yes, the upgrades are worth every penny. I went one step further and upgraded my aR12-TSSOX with Furutech GTX-D rhodium plated duplexes.
In my setup, the duplex upgrade made much more sense. All of my wall outlets are already upgraded with GTX-D (R). My Au24 SE power cables (12 of them) are upgraded with Furutech FI-28 (R) IEC and Male plugs.
IMHO, the Furutech offers much better dynamics and resolution. I had about two weeks of burn-in with aR12, each day has been nothing short of a revelation. I have noticed better bass extension; top and and mid range is more transparent and hits that 'sweet' spot every single time. The music is far more solid, dynamic and controlled.
Furutech's build quality is simply top notch. I won't deny the 'high' price tag but the overall level of improvement far outweighs the asking price.
Hope this helps!