Jaapjess,
If you like their sound and they're working well, I would keep them "as is". As Shadorne said "some progess" and truth be told, probably not as much as a lot of manufactuers would have you believe.
If you like their sound and they're working well, I would keep them "as is". As Shadorne said "some progess" and truth be told, probably not as much as a lot of manufactuers would have you believe.