HSP customer service is the best on the market first and foremost, real people who understand and walk you through. The quality in my opinion is the very best which is why i chose them. I bought a deluxe bundle and it's as if the trucks engine bays should be designed with HSP designers and machinists to ensure reliability and performance. I wouldn't use another brand personally, at least for a Duramax. I love their products so much i window shop more items regularly on their site because i wish i could buy more from the company and make my entire truck an HSP exclusive Pickup.