I have a set of StopTech ST-06 BBK on my fronts. They perform as well as Brembo and were 30% less cost. The price you found is even better than that!
The race pads my set come with are dustier than stock 550 M-sport pads, but StopTech makes a ceramic pad that sacrifices a little in braking performance for no dust. I was told in normal driving I'd never notice it, so I just ordered a set.
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2013 BMW 550i xDrive Alpine White [300] | Black Dakota [LCSW] | Anthracite [4CE]
Options: M-Sport [ZMP] | DDC+ARS [ZDF] | Exec [ZDB] | Driver Assist/+ [ZDA+ZDB] | Cold [ZCW] | SAT [2TB]
Mods: MORR VS8.2 + PSS (20" 255F/285R) | ACS Springs | Dinan Stage 2 | StopTech BBK
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