Summary: Sharing my recent purchase experience with velodyne vx11 Why i say poor product quality? 1. Unit not working and faulty which means no quality assessment and checks 2. Volume control knob connected in the ICs are not working which means potential sub standard material. Is this a common issue in china made products and patented in the US? 3. Amp was found faulty yet this is a new product.Another example of poor QC check and poor components.