A pal of mine had the OX on his D30 swapped into his suzuki samurai. He hated it; always had issues trying to get it in and out of engagement. That's about the extent of my OX knowledge but you asked.
I've run ARBs on my Fronty now since 02' and my experience is mixed. Usually reliable but i've experienced a melted air line (replaced it and for the life of my i can't explain how or why it melted, being protected in the frame and all) and it hasn't happened since. Also for a while the rear axle would lock and not unlock (I would have to unscrew the line to let the pressure off), then it fixed itself, and many times the compressor would run and run and run off and on, as opposed to building pressure and turning off once like it's supposed to.
That said i'm not a big fan of ARBs anymore. I love Detroit lockers; no maintenance, all good.
Not sure i want to get into the D35 D30 debate. I've seen enough of them wasted (including mine when my YJ was stock) that i'd never own them again-ever. Concur on the 8.25...that's a POS too. I also don't think the 8.8 is worth the $ either. damn i'm opinionated
George is a good dude, and a dare i say talented off road driver; i can see how he could keep axles alive. My only thing is I always want to try harder and harder obstacles, harder and harder trails, and push my abilities and rigs abilities beyond what i'm ready for. That's why my YJ junker now sports a cage and D60s with bigger rubbers.
My only regret is not going to D60s in the first place. My neighbor is a great guy, with a lightly built TJ. After hanging with me and busting up his poor POS on Pritchett canyon, he's now going straight from D30s to D60s. It's a punch in the wallet and face, but worth it for rockcrawlers.
Back to topic; i went with spools for my junker YJ because of cost and simplicity; but to be honest if i'd heard more good things about the OX i wouldn't mind having it in the front. Fact is i just haven't heard good things about them.