Voltage regulation maybe, but power conditioning does. It got rid of some of the graininess ... if I had to describe the difference, I would say it was very light but it's like using an overdrive pedal to smooth things out a bit.
If you have no experience with this unit, then make sure your comments can be verified factually ... Noise Filtration >
LiFT offers AC power filtering to ensure clean power for unequaled audio & video clarity. Clear Tone Technology provides tuned filtering circuits engineered for instrument amplifiers to provide a clean and consistent tone.
I should add, we are talking about two things here. Voltage regulation, which protects you from voltage spikes and maintains a consistent voltage for protection; and power conditioning which is the cream on top of the cake. Voltage regulation is what most people prefer this technology for, but if your going to go 2/3 the way, why not go all the way? So sweeten your tone if you want to.
A funny aside, the Furman emits EMF up, so the unit is on the bottom of my rack upside down. Flipping it did make a difference because my power amps were directly above it