I forgot to mention this after I made axle soup at Moab, back in March.
I had Warn Premium Hubs, and Warn Hub Fuses in the Gnewt, and grenaded TWO outer axles (the second one, I blew the CV cup into lots of little pieces), and the Hub Fuses show no sign of fatigue. So save your money, the fuses will not save you from having to replace an axle.