I bought the Master & Dynamic MW09 earphones from the manufacturer when they 1st came out expecting premium quality for the $399 price tag. Initially, the sound was good and battery life exceptional. However, less than 18 months after purchase, the left earbud’s volume dropped to almost nothing and started buzzing when inserted, making it unusable. I contacted Master & Dynamic for support, but their response was shocking—standing on a 1 year warrany, they refused to repair (They said they don't have the ability to repair their own product), or replace the earbud, telling me to take it to an electronics repair shop. For such an expensive product, I expected much better durability and reasonable customer service. This is unacceptable, I can't believe Master & Dynamic will not stand behind their very expensive product. I can’t recommend the MW09 or this brand to anyone. Save your money and look elsewhere for reliable earphones