I've been using Sonarworks since 2016 for headphones and speakers. I'm super grateful for them as every part of the experience working with them has been top quality, quick and easy. That includes support and the products in use. I've worked with dozens of mastering and mixing engineers and since using Sonarworks I'm getting much better feedback from them on how well done my mixdowns are. They are even listing my tracks on their website as examples of their mastering work and I largely credit that to Sonarworks for helping me hear things in a balanced way! I've been using the DH 650 headphones (and need to get a new pair in the upcoming months because I've had them forever) and I've been super happy with them with Sonarworks correction applied.