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These are my first pair of electrostatics, and they are certainly different to any dynamic or balanced armature headphones and IEMs I am familiar with.
They are "neutral" in the strict sense of having a flat frequency response, so appears somewhat bright when moving from a more traditional rolled-off treble, I would imagine if these were your daily drivers, one might become accustomed to it. Most people prefer a downward sloping frequency response, so some judicious use of DSP might help.
The sense of brightness is also due to the lack of distortion. When listening to low distortion systems (headphone or speaker based), it may appear that "something is missing". Well something is missing - distortion! This again can take a bit of getting used to. Some people don't like to give up their distortion - witness the popularity of valve amps. It's not for me to say which is right or wrong for the listener - it's a matter of personal taste.
(Bear in mind I'm nearly 50 years old so when I talk about treble, there's a certain part of the spectrum I'm no longer able to comment on. My faculties are in an inevitable decline.)
Do the Koss ESP/95X deliver the fabled electrostatic sound? In a word - yes. The level of detail was quite overwhelming on first listen. And I don't think it's solely due to the frequency response. The hackneyed phrase "I heard details I had never heard before" can, in this instance, be trotted out without a hint of hyperbole. Believe the hype.
They are very comfortable, but it's not very warm in the UK, so impossible to say how they would feel after an extended listening session in hot weather. (Hot weather is not something that UK residents need to consider very often.)
One downside, they are extremely susceptible to ground loops and hum, care is required when situating.
Am I happy I bought them? Yes, I am.