Since you have experience with both can you please tell me if there is any noticeable difference in the build quality of the two....... Is v2 better in that regard or is it the same......
Same build quality except for the following:
magnets: v1 - painted over; v2 - unpainted (exposed)
rear grille cover: v1 - mesh; v2 - ~speaker cloth
comment: I thought I read somewhere that the paint was flaking off the magnets of some of the large earcup models, so Hifiman decided to leave them unpainted. I was under the impression that there was more to the paint than aesthetics, like better protection for the magnets against corrosion. Anyways, the speaker cloth does a better job of covering up the exposed magnets from view but not necessarily from the elements.
earpad dust cover: v1 - on the earpad; v2 - in front of the ear cup chamber.
comment: The v1 configuration allowed one to access the ear cup chamber, which is sometimes necessary to remove a hair strand that managed to find its way in there and cause driver buzzing. The v2 does not allow that anymore since the dust cover is now over the earcup chamber. Still, one can probably remove the dust cover from the v2's pretty easily and use the v1 earpads. However, that will likely void your warranty. The v2 design does allow for greater depth for those with large/wide ears.
earpads: v1 - ultrapads (w/ dust cover); v2 - harmony pads (w/o dust cover)
comment: Now, this could be just personal experience, but the harmony pads that came with my v2's were considerably stiffer than the v1 pads, which made the v2's unbearable to wear after ten minutes or so since the lack of give made my jaw ache. When I wore them for over 30mins and took them off, my jaw ached for the rest of the day. In contrast, I wore my v1's almost daily, hours at a time, without any issues due to the softer ultrapad cushioning. I don't know if it was product variance with the harmony pads that came with my v2's since there are plenty out there who seem to have no problems with these pads. After more than two weeks, the v2 pads weren't getting any softer. So, I obtained a new pair of ultrapads, cut out the dust cover, and used them with my v2's. The new ultrapads were considerably more comfortable than the harmony pads that came with my v2. After swapping out the harmony pads for the ultrapads, the comfort level of the v2 returned to the same level as my old v1's.
yokes: v1 - metal?; v2 - plastic
comment: I do not remember if the v1's yokes were metal, but I strongly suspect that the v2 yokes are plastic since they feel and ring differently from the yokes of my HEXv2, which are definitely metal.
I hope this info helps!