They are a pretty dark, laid-back headphone. They handle EDM, synthwave, trance, acid jazz, metal pretty well. They aren’t the most detailed when it comes to treble response though. A common criticism when it comes to the NightOwl is that they sound muffled. If you’ve heard Sennheiser’s HD 6++ lineup you will be familiar with the veiled mids.
The Aeon Closed has a much more natural sound while still maintaining some pretty good low end. The NightOwls and the Aeon Closed are pretty similar in comfort but I haven’t spent enough time with the Aeon Closed to do a true comparison between the two. I have a pair on the way and should be here at the end of the week or Monday though so I will do a better comparison then! Same with the Cascades. The general consensus on the Cascades though is that they do clamp pretty tight so the NightOwls probably win out in comfort.
At $399 I would say that they are fairly priced. At their previous price point, they were definitely too much. They do have a very different tuning from other headphones though so they aren’t for everyone, no matter what price point they are at haha.