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Agree with 100% with socale39 regarding brake pads. Aside from initial bite and dust, there seems little reason to spend huge amounts of money on friction material. Likewise for rotors that are little more than a machined disk of steel. It boils down to pretty much rotors with a coating that minimize rust or cheaper ones without coating. The OE rotors on a 5 series are a little different being of two-piece construction (steel disk and aluminum hub). However, replacement, even OE ones, seem to be one-piece (all steel). Once again, these are consumable items that don't seem to matter if they are from a BMW dealer or Rock Auto. High-end rotors are also available with milled slots and/or holes, but it's doubtful that the average driver would ever tell the difference.
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