Have had these phones for close to two months, and I prefer these over the sr-007, lcd-2, and the HE-X. Those I drove with dedicated Dacs and Amps, like the KGSSHV for the sr-007, but I am only driving these with a Asus STX II sound card, and though I have been tempted to purchase the mojo I am really just loving the sound. These phones sound faster and more resolving than the setups I had before. May not have a massive soundstage, but damn they sound so good. Really good stuff from Focal. Honestly, I am going to keep these until I am in a position to buy the Utopia.
One compaint was a slight roughness to the sound that has gone away with use, also my upgrade to an UP-OCC cable helped even more. Really detailed and smooth now.
This is with Tidal Hifi being streamed via Roon. I would invest in either roon or Amarra as they sound noticeably better than the stock tidal player. Roon might burn a hole in your bank acct though. Were I to use a car metaphor I would say Amarra is like a run down car with a surprisingly clean interior (SQ), and Roon is like a brand spanking new Bugatti Veyron. You can imgaine how the interior looks...