Ty,
Slight opinion difference: AFTER Duke left the scene, I noticed some improved factory QC...
(2) Many fliers spoiled by the plug'n'play AB? engines don't have the finesse to get a Fox engine going - IMHO. What I've found over the past half-century+, is that Fox engines work, do what is expected of them, if you learn how to coax them in. NOT claiming they are the world's ultimate, but that they CAN be dependable, long-lasting power - given that their range of ability is understood. It is often ample...
Haven't yet run an ABC-Upper or ceramic Fox, but expect that the "family heritage" factor would apply to those, too.
(Subject to empirical change, which will/would be reported honestly.)