All of the blue calipers are the same (Brembo) they are used in the M2,M3, M4 and as an option on most other BMW models. The squeaking discussed above is because of the pads not the calipers, basically the moisture creates a rust layer and you have to generate heat to work that layer off. Not a big issue. There are some very good aftermarket pad options that not only resolve this issue but also reduce brake dust.
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