I missed that part too.
The only problems I ever had with braking in the rs4 were : brakes faded (on track ) , discs cracked and pads were bad quality. Maybe I don`t use the brakes as much as needed to make me see the alcons as an upgrade.
The OEM caliper is "pretty much" top of the line as far as what you would find on a street car, coming from the factory.
I had un-even wear on the disc, the stock pads were crap.
Changed pads to ds2500, changed discs and I find braking to be very good but hey... maybe i`m just a carebear

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By all means don`t let my posts keep you from geting the alcons . I`m just saying I as in me as in duud40 don`t see the point .
Not once did I need more stopping power . For me at least, the limiting factor was always tire traction . Whenever I was on the limit with braking , the tires would skid.