Should we upgrade high end fuses?

Good point, Uru.

Fuses do make a difference and are simply another tuning tool. The main difference is between Ceramic and glass cases. Glass is more open sounding but brighter with it (Glass resonating?).
Ceramic fuses are cleaner sounding but can tend toward dull with the wrong make or in the wrong system. most of the so called high end fuses are ceramic so are cleaner immediatly which is nice as they can now charge more for them. however I will probably buy some because the better "high end" fuses use silver elements instead of a tin alloy and hence are more open which may offset the warmer sound of ceramics and just lift the sound slightly.

A cheap fuse is much like cheap tubes, cheap sockets,cheap interconnects and cheap speaker wires, cheap power cords etc.

They all work.

If that's all you want stick with them.

Some of us have found out that upgrading the fuse makes an improvemnent, just like upgrading the other things i've listed.

While you're at it, upgrade to dedicated 20 amp lines, and better receptacles, better IEC connectors and RCA inputs.

The total end result is well worth the extra few dollars.