PSB Goldi, tweeter upgrade.

PSB Goldi,tweeter upgrade.
i have a set of these..please tell me more

I found out the tweeter used in Goldi is Vifa D25AG07-06 (specifically built for PSB). This tweeter is 6 ohms. A litttle bit better tweeter that we can upgrade from Vifa is D25AG35-06. However, I don't know it is worth to upgrade the tweeter or not.