In reply to purplemonkeyelephant: I have the joker it's an excellent rope. Personally I wouldn't get too bogged down in the test as they are far from real use/life.
If an edge is sharp enough and you manage to slide a loaded rope across it your probably toast.
I bought it for professional use and have allways used beefy 8.5 mm halfs for the sort of stuff your thinking about. apart form rope swings where i would only use someone elses rope!
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I one met a team of 2 frech guides, 2 clients traversing the grand jorasses with one twin 50m rope each....
weight matters!