So I went and did it! After many months of deliberating over these I finally, after having heard them several times, even mounted on 2395 lens horns, went and ordered six TAD 4002 mid drivers. These are going to replace my JBL 2441 drivers which have been in service since 1980. They served me well, and I loved their sound, but the TAD 4002 is just that phenomenal.
The depth and clarity they have is simply outstanding. The transient response is so fast. TAD says this is the work of the berrylium diaphragm . And they have such a clean, smooth sound.
The only drawback to TAD is the price. And they are unbelievably expensive! But they will be with me for as many years as the JBL,s so its ok.