Of the IEMs that I have heard they are clearly the best (I have heard from Sennheiser to SoundMAGIC, MEElectronics and Apple's ones), far better sounding than any portable headphones out there (tried Beyerdynamics 501 P, AKG 430 and B&W P3) but aren't the easisest to drive, they need good amplification so do not pair them with a bad smartphone.
I will keep them, I'm finally satisfied.
P.S.: They need some hours to 'open up'. Let them play.