Semi metallics dust alot and are harder on the rotors. Although they are best for the initial "cold bite".

Axxis deluxe is organic mix, i think some ceramic in there too, and it keeps 80% of that semi met cold bite but super low dust.

Ceramics are good and usually dont dust much either, but on some you lose more of the cold bite, although once warm they work great as well.

Right now in running solid rotors up front (no xdrilled or slotted) cause i kept the old ones, with axxis deluxe pads.

Rears i did the other day- ecstuning geomet xdrilled/slotted and powerstop ceramic pads.

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2006 X5 4.8is Fully Loaded