The compressor and air suspension struts on my A8 2005 were defective. The dealer wanted about $2,000 for a built-in compressor and when I looked for an OEM compressor I found one for over $800. I bought it after seeing another positive review, gave it to my local Euro mechanic and had it installed. He said there is no difference between OEM Bosch and this DEDC. Saved $500 and works as usual! I will update if I encounter any problems.