I wouldn't bother with them. To me, they are a purely cosmetic upgrade, look just a little silly, and have no performance difference in terms of stopping power. Some like the look. I do think that they are better than drilled, which are usually structurally weaker due to the drilling, and are often sold with nonsense claims relating to gassing of the pads.

I wouldn't worry about noise with the slotted rotors if that is your concern.

PS: The OEM pads aren't harder on rotors IMO. No noise worries because they have carbon black in the compound, with the side benefit of black dust. I wouldn't use any grease behind the pads myself. I would ensure that there is a coating of high temperature grease on the ears of the pad, as that is the usual noise conduit. Break that link with grease, and they are quiet in my experience.

__________________
2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue