I absolutely love these headphones. I’ve got a pair of HD650’s and the HD6XX. With a good enough amp, the Sennheiser’s win, in my opinion. However, the K7XX sounds fantastic to. And due to their 62 ohm impedance, you can use them with lower powered equipment. I have the Sennheiser GSX1000 for PC gaming. Yes, virtual surround sound is usually garbage. The GSX sounds fantastic, but doesn’t have a high powered output. The K7XX pairs wonderfully with these. Even though they’re semi-open, the soundstage sounds great. The K7XX and the GSX1000 makes for a wonderful virtual surround sound experience. And for on the go use, they work great with the AudioQuest Dragonfly Red DAC. Lastly, they are super comfortable. I forget I’m wearing them. Buy these, you won’t regret it.