Don't know how good the headphones are but the price is good. Spotted this on PriceSpy. Cheapest on PriceSpy is $399 and hasn't been cheaper before. Got pretty good reviews on Amazon. Free Shipping on all orders over $100.
Yamaha is known for their early adoption of hi-fi across a diverse product range. Yamaha can draw from years of industry experience, from recording music to playing it. The HPH-PRO 400 benefit from Yamaha's vast knowledge and feature a professional grade quality that makes them sound phenomenal.