I've wheeled my XJ on 35's with Elockers all over Colorado and out in Moab.
No problems at all. They've locked when I needed them to and unlocked when I turned them off. They haven't exploded, leaked electrons, or likked any Nuns and Orphans....
That tells me all I need to know.
I don't race or compete with anyone. I built my rig to suit my needs and expectations. I never even considered an airleaker.
The vast majority of people that frequent this site aren't rock-racers, they are folks building budget minded rigs that they can wheel to and from the trail. I would venture to guess that there are a relatively small group of hardcore racers that even know

exists, much less come here and ask about lockers.
One thing I've learned about XJ drivers is that they are frugal bunch, some are just down right cheap....not that that's a bad thing mind you (I sure am!). We drive a rig that hasn't been produced in over 10 years. We scour junk yards for the near mythical XJ Dan44 rear axle. We drive them till our floor boards rust away and then patch them back up.
If a guy is going to spend the money on a Dynatrac axle I'm sure he would take their advice. When you're building you're own axle on a shoestring budget for use under a DD/weekend Warrior, well who really cares about what Dynatrac says?
Early d60 e-Lockers were junk, Eaton redesigned them. I can't say I've heard any negatives about the redesigned ones. I'd run one if owned a D60.
Any locker can fail and generally do so at the least opportune time....regardless of brand.