Yeah I've been using them for PC gaming for like half a year and I can say they are very fun and suitable for it. I haven't played anything for a while now, but I can update you once I fire up my machine once again in a few days for my most recent feelings.
From what I recall though, nice full, impactful bass in games with explosions, fair amount of detail, soundstage is adequate but not as good as other open-back headphones and it is definitely harder to track movement in shooter games.
Overall engaging and fun sound, but may not recommend them if you like more flat airy sound: in my case HD555 which I liked very much for gaming, hard to say if better as I haven't used them in a while, but their sound was very different - less alive and fun with a bit lacking lower end, but more balanced, realistic and open).
