Just more voodoo snake oil product salesmen.
As far as BS fuses go
If you don’t want to blow $150
Change your old crusty fuses that may have seen too many turn on cycles (pics attached), then do it with the same $1 fuse, not the BS $150 SR boutique ones, as they will sound the same and age just as fast.
Pics of fast and slow blo fuses that have seen too many turn on cycles over a couple of years.
https://ibb.co/PzWvzwr (left to right over time aging)
https://ibb.co/17Tvy6t (right to left over time aging)
Cheers George