Yes. I've never had to return a part to AZ due to poor quality. I've bough brake calipers, wheel bearings, rotors, CV joints, spark plug wires, ignition coil. Also, as I covered in anther thread, the longest lasting battery I've ever owned. That's just what I can think of off the top of my head. All part have lasted at least as long as the factory originals. However, I've never bought parts for Mercedes there.

I used to use Shucks/Checker because they were close to my house and in my opinion they sell junk. The stories listed above sound more like Checker than AutoZone, to me. The last part I bought at Checker was a Voltage regulator for a VW that failed 3 times in 4k miles.

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1979 240D, 4spd manual, Power Sunroof, manual windows, 147k miles, Pastel gray/Black MB Tex.
1991 300D 2.5 - Smokes like it's on Crack!