I wouldn't bother changing upgraded fuses.
Think of it this way.
However much they "might" degrade overtime, they will still be sounding better than a stock fuse that "might" be degrading over the same period of time time.
The emphasis on "might".
Until some misadventure or faulty component trips the fuse and it blows, I wouldn't bother changing them.
Is this a paradigm shift?
We now have something that doesn't sound better after a break in period?
I prefer to think my Supremes are sounding better with age.
Think of it this way.
However much they "might" degrade overtime, they will still be sounding better than a stock fuse that "might" be degrading over the same period of time time.
The emphasis on "might".
Until some misadventure or faulty component trips the fuse and it blows, I wouldn't bother changing them.
Is this a paradigm shift?
We now have something that doesn't sound better after a break in period?
I prefer to think my Supremes are sounding better with age.