When you see in a guitar/amp manufacture's literature that they have improved a product, what has been your experience? For example, when Celestion reissued the Alnico Blue in 1993 after being out of production for over 20 years, I was ecstatic. Incidentally, The Cold War kept Cobalt; one of the ingredients in Alnico (Aluminum/Nickel/Cobalt), at high prices. You need that speaker to get British Invasion, Brian May, etc. sounds. I've heard the originals and I thought Celestion did the best job possible with what is available to recreate that speaker. That didn't change or try to "improve" anything; that inevitably results in an unwelcome change.