Very comfortable. You can hear your enemies from a great distance.
I hesitated between this one and the beyerdynamics 770 pro 80ohms, I took the astro a40 and I am satisfied!
It is very comfortable, I can wear it for hours in absolute comfort (as long as it is adjusted). With proper tuning using the astro commander EQ software, you will hear your enemies coming from far away.
Its dedicated sound card will allow you to manually adjust the sound of your interlocutors and the game directly in game (very practical!).
The only problem, and I reported it to the ldlc support and the astro gaming support, is that when I speak, my teammates hear a cricket noise, which is quite unpleasant.
They sent me replacement cables/microphones, but it didn't change anything, there's still a weird noise when I talk... :/ shame about the price, almost 300euros.
It's a great product.