I put a Furman Elite PFi into my system in December. All the positive changes in sound occurred, and it has enough juice to run my MC252 and Vandersteen sub. Most notably the Furman back-regulates the power: my PS Audio Noise Harvesters, which were plugged into the wall outlet, and into the RGPC that the Furman is plugged into have stopped blinking. This indicates that the noise in the wires prior to the Furman are now clean of noise.
Very good results for the money.
