I have pair of One18 in my mastering facility and they are the best thing ever. At first, they sound a bit boring, but when you start working with them, youll be amazed. I still have not figure out whats that magig about, but they reveal instantly what you need to do, and when you are ready.
Maybe its the phase coherency, or lack of distortions, but oh boy these cannreveal and present every miniscule details. Even slightiest dynamic chances you make are there!
Yeah, im a huge amphion fanboy nowdays.