I have run Pioneer for a long time and loved the sound quality. I have owned different brands beside pioneer like in my wifes car and my work car. But the sound of the highs and mids that you can fine tune is amazing. I was about to scrap the system in my wifes car till I bought a Pioneer Premium 7500 HU and really brought the sound to life. My buddy swears by Alpine so both brands obviously wont disappoint!