Well, for my part, I returned my IT01 today. Main reason was that I received a plasticky looking red/blue pair instead of the black one I had ordered. But of course I also listened to them... and that was the second reason for my decision to return them. I personally think they're decent sounding, but not better than the TFZ Exclusive 5 and Maxell GD200 I own. Which makes them somewhat redundant for me.
Interestingly, all graphene IEMs I've heard so far have been distinctly v-shaped. And while I like the technical prowess of these drivers, I wished that someone would come up with a better balanced stock tuning. Until then, the BW-ES1 will likely remain my graphene favorites... not because they have the best stock sound, but because they have the best price-to-performance ratio and modding potential.
As it stands, I prefer my modded BW-ES1 over the stock sound of all graphene driver IEMs I've heard so far, including the IT01. That's not to say that I think the IT01 are bad, they're not. Just not the step up in graphene driver sound I've been looking for.
