I have been using Furutech for years now before they became 'force' in United States. I started with Hubbell outlets, then switched to FPX (G) and finally to GTX-D (R) on all of my wall outlets, power conditioners and FI-28(R) on my power cords. IMO, every tweak has a cumulative effects on the sound. The overall synergy of outlets with plugs is simply outstanding.
I was able to achieve ultra smooth vocals at higher volume, better dynamics, tighter base and excellent tonal balance with Furutech's in my rig.
I agree it's a expensive upgrade but guys it's worth every penny. The outlets and plugs build quality is phenomenal.
I won't be trading up to NCF for a good while.