I really wish I had the HE-1000 or some other flagship headphone to really test these.
Running balanced AKG 7XX an hour in and it already sounds awesome. The V2+ is similar, but it is immediately noticeable that the X Infinity is better.
Some bad news, my LPS doesn't work with it. Tried 2G, 1G, printer cable, all fail to play with the LPS in the chain. Without the LPS everything works fine. May need to RMA the LPS.
At this point would you expect anything less?