Read the info on Foley site.
Wouldn't give up my Hurth based on the "6 tips"
3 of them, pitching their ATF, their cooler, and their upgrade from 100 to 150, sound too much like a commercial
Read the other site info extensively, where they state that Hurth boxes are good, if not undersized, overloaded, or abused.
IMHO, same could be said about any transmission.
AAMOI, I have worked on B/Ws where the ATF was cooked like shellac and the plates where heat-blued.
But they are good boxes, the B/ws I mean.