I go through fronts on the 300E every 15-18K miles or so with the OEM compounds. I have yet to replace the rotors, but plan to on the next swap.
Note that this is my daily driver, and endures a lot of typical heavy traffic braking scenarios.
Did the rears on the ML for the first time a couple of months ago, and it appeared to have about 50% of meat left. The dealership did the fronts at around 27K, but if I had had a chance to inspect them, I'll bet I could have gotten more mileage than that! I will contend that this is a heavier vehicle, but since it's duty is relegated to weekends and vacation driving, I don't really stress the brakes on it as much...
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car