Well, "tore open the box" may be overstating it a bit because big expensive headphones and surprisingly small packaging that I had to gently repack for my commute home. Ha!
That said, I'm A/B testing the Teaks against my current pair of Fostex TH-X00 EB with the Grace m9XX and finding the overall frequency response of the E-MUs might be a touch more neutral. They are quite similar, with the differences being a matter of degrees. The Ebony digs deeper and is louder in the sub-bass (it's crazy, they are total bass monsters imho) but that might because the driver is broken-in. The Teaks could conceivably open up like that after a few hours. The treble on the EBs peaks a bit earlier where there's more activity in the signal, while the treble on the Teaks have a slower climb to 20K. As a result of all that, vocals and guitars on the Teaks seem a bit louder and have a bit more presence in comparison, although I don't know enough about audio engineering to say exactly why. Hence the perception that they're more neutral. If someone told me that the EBs are closest the Massdrop exclusives get to the Teaks, I'd believe them.