If you're prone to standing on the loud pedal to get through things, a full locker might be a great way to need to carry spare half shafts... You simply have to be careful if you're pulling really hard on one front tire.
A torsen style diff keeps the front form grenading, but does occasionally need a little help from the brakes when one tire gets too light.
I'm running a TruTrac in the front of my TJ, and I LOVE it. (Works pretty much the same as the Torsen) If I see a tricky spot coming, I add a bit of brake with my left foot just before I get crossed up and motor right on through. I have a Rubicon rear locker, which works about the same and I hardly ever bother to lock it using this method in general exploring.
Plus nothing to go wrong, and a slightly cheaper install than an e- or air locker.