For what it's worth I bought the v1 again a few weeks ago in a moment of boredom ( previously I had 2 that were replaced with the Bishop, SIren v4, etc... )
Luckily I haven't had any issues so far with the deck threading. Or any wicking problems.
Also bought the short tank kit / bigger chimney which has been fine.
And I can dial in the airflow on this one so it's quieter than the previous 2 I had, for whatever reason.
I think most of the issues with the v1 were probably down to bad qc on Dovpos' side, and just luck of the draw.