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@onyerbike
I think it's to do with the amount the levers pull the cable through - older SLR will pull it through presumably a shorter distance, so will be less effective than Super SLR which will pull more cable and therefore the pads better contact with the rims.
More than welcome to just try them out and see if they work well..
Some more info: http://www.bikeradar.com/forums/viewtopic.php?t=12893683&