Purchased this to add an old subwoofer amp to my 2006 Mercedes CLS 500, that I had laying around from another vehicle.Instructions were OK, but could have been more detailed.The sound quality is excellent, and on par with any of the other converters I've used in previous Mercedes.The biggest gripe I have with this product is that it is little too big, which limits where you can mount it, up front, without looking tacky. The Manufacturer should build it as two seperate units. A small remote volume controller up-front, and a Line level controler connected near speakers in the trunk. Then provide a 20ft or longer cable that connects the two. Installation would be easier if configured in this way.Bottom line is that it looks and performs exactly as seen an described on the manufacturers website, but could use a small design improvement.