I for one did have build-quality issues with my unit. The leather headband was way too short and thus had too much tension, causing an uncomfortable concentration of the pressure on the middle of my head. Two esthetically questionable foam cushions passably helped. Later successively both sides of the leather band separated from the frame. I couldn't fix it any other way than with super glue. Another problem of the headband was that the stops didn't really provide reliable stops; each time I took the headphone off and put it on again I had to readjust the headband. After maybe 1½ years the right socket began to develop interrupts and finally died. So I brought it to my dealer for repair or replacement. I got a brand new pair. With which everything is fine now, except for the headband stops, which could be called nonexistent. My solution was to hammer some short pieces of wire into the stop holes of my preferred postition. I was glad when the V2 pads were finally available – they provided a definitive improvement both sonically and in terms of comfort. A few weeks after purchase the polyester skin of one of them began to separate from the foam filling. After all I got a new pair for free. So far no problem anymore.
Of course my sympathy for HiFiMan has greatly suffered, not least after the temporary V2 pads boycott. On the other hand I'm not strictly against improvements of existing models and don't feel duped by the SE. I will certainly audition it and compare it with the Susvara (of which I had a brief audition already – to my ears the DAVE can drive it effortlessly, with better sound than via EF1000). Well, the sound quality of HiFiMan's top models is simply too high to be ignored.