Have the Z26's with cross-drilled Zimmerman's. Like everyone else, no squeaks, almost no dust, and have a click every so often when changing directions on the A6. They're more than adequate for street use. Spirited mountain driving, or braking when towing (roughly 1800 pounds) down long steep mountainous roads and they do start to glaze a bit. That being said, I'll be using them again when I upgrade the calipers to larger ones. Cleaning the brake dust from the stock pads every 2-3 days sucked.
Put the Z23's on my father's GLK and they have way less stopping power for some reason, especially when compared to the Textar pads I took off. That being said, they didn't click when switching directions.
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