Very good sound quality, however they are a bit on the large side and let quite a lot of sound out, for these reasons it means that they are an excellent pair of headphones for indoor use, but not for public use at all.
 

i recentely got these for christmas after Much deliberation. Excellent sound quality music quality permitting, Very comfortable headphones that hug around the ear, all in all very good. my only quarrel was that they dont keep outside noise out too well but then again they are open back
 

I am very impressed with the sound prduction quality.They are very comfortable to wear being fully adjustable and having lage soft foams are suitable for long periods of time. The design in terms of looks is pleasing to eye although they are perhaps a little too large for commuting.
 

I am very pleased with my new Sennheiser HD 515 headphones. I had an older pair of Sennheiser's. Headphones that I have used for years, but the new one is really an improvement. The sound is spacious and open, with a clear reproduction of each instrument in smaller jazz groups. I used a Diana Krall-CD as a test, and was very impressed! Congratulations on a new and good product.