As far as audiophile fuses go, I have only tried the Hifi-tuning gold ends version. They made a very substantial improvement in both my tube monoblocks and my tube preamp. However, in my system and IMHO, these fuses take a while to fully flesh out. The first couple of hours they sounded very sparkly and nice. The next three days it sounded like a blanket was placed over my speakers. At this point, I almost took them out, but I hung in there and on day four, the blanket was removed and the sound continued to improve thereafter for up to 300 hours. I know. Call me anal. (o: Here is the best price I have found on these fuses:
http://store.acousticsounds.com/d/41414/HiFi-Tuning-Fuse_-_Large-System_Enhancements
Here is a link to some lab tests comparing some popular fuses:
http://www.partsconnexion.com/prod_pdf/hft_facts.pdf