This Kore headset was my first headset. Still use it on occasion...yesterday actually.
Most headsets bother the top of my head for some reason, but the Kore doesn't. Best I've ever worn for that, including Bose A20, David Clarks, Bose X, Faro, ASA, Lightspeed 33, etc.. (haven't tried the Lightspeed Zulu's yet), and thus the reason I also bought Halo's.
Here's my quick report (and opinion) on the Kore if you are interested:
1. ATC seems to ask me to repeat myself on occasion. Not so when using the Halo's (or others mentioned)....and not overly so, but I noticed.
2. Once in a while an odd static/squeal may occur, depending on the plane and/or headset combination. Unable to resolve on two occasions, and swapped out headsets.
3. I hear a little more clearly with the Halos (and some of the other brands mentioned).
4. Very good noise reduction for a passive set.
5. Super comfy on both the head and ears.
For the price, they are good.
For top quality on all accounts, especially sound, I have to agree with getting a higher end set like Bose or Lightspeed. And Bluetooth (to your phone or other device) can be useful at times.
Added bonus of Kore = if ATC keeps asking you to repeat yourself, you'll get more practice with radio calls!
(that's a joke)