Have you ever installed ARBs??? Just wondering because there are no "adjustments". The only way you would have adjustments is if you were running a different compressor and needed a regulator before the "actuator" (which its really called an air solenoid). But even that isn't hard, you just want to limit it to 100 PSI. Worse thing that can happen is the seals leak, which isn't "critical failure". Im not trying to be rude or mean, but it doesn't sound like you are familiar with them, in which case you don't really have a valid piece of advice on the product itself.
You're pretty much correct with the Ox, if the cable isn't right, it may not engage all of the way which can cause the locking ring to strip out.
Im torn on the super 30 vs 27 spline... IF you get the 30 spline stubs and unit bearings to go with the 30 spline inners it makes a lot more sense (but this is VERY pricey). But the problem is like what David said, if you break one you are screwed unless you bought 2 sets, in which it's double very pricey lol. While the 30 spline stuff is a lot stronger on paper, it's still breakable, and if you do manage that feat, your trip is over until you can get another one. With the 27 spline locker, at least you can throw in a stock shaft and keep having fun!