Most amp manufacturers don't believe in after market fuse, and in lesser extend -power cords. I have had several well known brands (ARC, Krell, CJ to name a few) and they all HAVE to say that it does not matter from a corporate point of view.
The IsoClean is of course better than stock but nowhere as good as the SR Red or the AH Platinum. I have tried most of the after market fuses in my systems and fuses provide indeed one of the highest ROI (highest is dedicated line(s), then AC outlet). When I try a new device, the first thing I do is to upgrade the fuse(s) after initial listening.