It's true about the ruged construction, fuses and lastability.
The lastability is probably because of the large fuses and low wattage, ofcourse things are changing and stock namebrand pc PSUs are becoming crap like the rest of the system. Yet, yes ... Dell still supplies half-decent PSUs. I'll try to find the forum and site that compared this.

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Any Dell, HP, or Compaq PC I've seen, cheap out on anything they can (motherboard, case, PSU, RAM) And only throw in a good processor, lots of harddrive space, and SOMETIMES a good graphics card, just so the idiot buyer thinks he's getting a 'good deal'
~Bryan~

Believe you-me, in no way am I arguing that.

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I've also heard that having dual +12V rails is actually worse than a single rail.

Yep. Less efficiency.