I'm an outlier when it comes to pads/rotors. I replace all 4 corners at the same time and use a cheap aftermarket brand. Brakemotive. They use ceramic pads and drilled/slotted rotors. Have installed at least 20 full sets across different manufacturers. Never had a full set cost more than $300. They come with new sensors too.

As with all ceramic pads, initial bite/feel suffers a little bit, but nothing crazy. The anchors still drop plenty hard when necessary. Very low dusting. Been using them for 15 years and came to them after reading about them on the Corvette forums. Sometimes they use PowerStop pads, sometimes StopTech, sometimes housebrand pads (all ceramic). Never had a problem or difference in performance with any of them. If I were tracking my X I might go with a set of blanks and organic pads from Textar, Zimmerman, or Pagid but for everyday use have had no issues.

But as with anything, do your research and make your decision.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)