nobody speaks of runin time Synergistic says 2-300 hours. 100 hours brings it over 90%
always should if possible Go to a bit bigger size for these are accurate and Can blow ,standard buzz fuse can vary over 15-20%, I found out the hard way with earlier versions.
theone in mySchiit Yggsdrasil made a very noticable improvement
my preamp section nowreplacing orangefrom blue , very overpriced imo, but worth it. Also as far as snake oil comments
great electronics Gurus like John Curl, and Nelson Pass as a small example has used them ,and they may know a thing or two about Electronics engineering !! There is on average 4 x less resistance from these top fuses vs the steel,zinc fuses,just lookup metals resistance index .the steel fuses are a bottleneck .