My TWF11 arrived today and I tried it with some Vaughan Williams symphonies.
First amped with Zo2 but that was to much bloated bass. Then with my favorite classical amp for IEM the ibasso T3. With low gain already a fantastic soundscape but surprisingly increasing the juice gave even more detail and power in the higher regions without any trace of harshness? Perhaps this is comparable with the results of burning in.
So for now thanks you all for your reviews of this wonderfull earphone.
It seems it is the first in ear which can cope with the large symphonic pieces in a detailed and fullblown way.
See what the Hifiman does with it.