I absolutely love the Goliath V2. It's the best tank I've tried and it's the only tank I currently use, because it's that good.
However, UD didn't tell us how to correctly assemble it, and most youtube reviewers do it wrong.
Build coils and wick as normal. (It's very forgiving)
Put chimney on first! Tighten all the way.
Put retaining ring on (held in place with o-rings).
Now unscrew chimney until it is just starting to pull the retaining ring up from the base.
Align JC notches on the JC ring with the retaining ring (chimney may need a slight turn to help with alignment).
Assemble glass and top cap.
If you don't follow these steps, you may end up with a sticking
juice control ring, stuck build deck, and dry hits.