I use this filter for 13 years in tri amplification (I use two AC23)
All is well, no complaints, except that the purchase price (6000 francs)
A filter of small bills, very average
A bit expensive (in nine) against the other, it is very robust and reliable: never any problem in 13 years and continue to function perfectly.
I totally remake the same choice
Difficult to put other things for the 10/10 crossover.