Gave it a try today and understand now. It's not something I can imagine using myself. I tend to use the cruise on all non-urban journeys and I let that handle the speed for me.
What I think would be useful is if you can use them together. e.g. Cruise is set to 70, occassionally you want to increase a little for passing and so you have the limit set at 80. I would definately use that.
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