I got the same hubs but the ratchet mechanism is slipping under load.
Opened the hubs trying to find the issue without any luck.
Did your hubs turn out ok and what seller did you order from?
Sad to hear that, I just know once the ratchets slip , they are damaged and the slipping will not recover but only get worse.
I ordered at newbike store.
During summer time I don't build wheels (unless there's a need for, e.g. a rim got an impact)
So I can't tell you about the reliability of mine.
I also must tell that I might not be the best reference as I usually don't have issues on the drive train with sudden/ early dead. I simply don't have that high absolute Power output, I also prefer high cadences.. so putting both together also the torques and forces are low.
W/kg may be high.. but that's not destroying free hubs luckily.