Anyone compared after-market,

Hello,

I believe that there are sonic improvements to be had when upgrading stock fuses to after-market fuses (such as Audio Magic, Synergistic Research, Audio Horizons, Hi Fi Tuning, etc, etc). To make things a bit more interesting, some of these manufactures of after-market fuses have different models of fuses also.
Has anyone done any comparing of these after-market fuses? If so, please include your thoughts regarding:
1. What fuse makes and models have you used or compared?
2. What piece of gear (ie, amplifier or preamp), and in what position you inserted the fuse (ie, rear panel a/c, internal line)?
3. Did you experiment with fuse direction?
4. Your view on the sonic attributes of the fuses you inserted.
I plan on upgrading the rear panel a/c fuse on my class D "NewClear" amplifier.
In advance, thanks for sharing your thoughts!