I haven't purchased from diode dynamics, but I have had customers bring me their products for me to install and they were really good quality products and my customers have always loved them once I got done installing everything. And their customer service is amazing! Very professional and polite, always reply in a timely fashion. I work in the car audio / 12v industry and wish there were more companies with customer service like diode dynamics! Anxious to get my Cherokee next month and check out their products!