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Originally Posted by Greg
what REAL WORLD benefits I just can't live without
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The answer is none, I think. You can stack up relays and custom control boxes on a traditional wiring harness and achieve the same results.
But here's the hook: ISIS separates switches and control knobs from the device, and puts a programmable computer in-between them. All the control wiring can be 28g wire, since very little current flows. And that computer can combine inputs, sequence inputs, time inputs, etc. The best analogy I can think of is a drive-by-wire throttle. A cable-based throttle works fine, and some would say it works better. (Toyota-bashers, this doesn't concern you, lol), but DBW has a control module attached to the throttle, and that input goes to the ECM, which then tells the throttle blade to move. The input "switch" is separated from the device by a computer.
Once you have DBW, you've got all kinds of things you can do. You can integrate cruise control, you can do cool things with pedal ratio, you can integrate heel-toe blips, you can support traction control, you can enforce engine break-in, etc.
That's what's different about ISIS. As I mentioned above, nearly all modern cars are wired this way.