On the video claiming their "locker remains locked when reversing, etc", I would make a point. Yes the locker remains locked, but the issue I have is that the locker (when locked) allows freewheeling tire rotation when changing directions. So, yes they are technically correct, but full...
If I were you, I'd be inclined to keep the ARBs. They have a long history, and are durable units. The air supply is something a serious wheeler should have onboard for tire adjustments, etc anyhow, and the 100% lock up provides the control you need when getting in and out of serious obstacles...