Are you getting good results with TC?
And are there any 510 drip tips that you like? As you can use them with the GT IV.
I do know that Ulton do a clone of the Taifun nugget drip tip, but don't know if that would be of any interest to you.
I've gone through two tank fills. Good solid output and TC (after all it is a Dicodes), I have not however dropped it yet.
Only slight condensation build up between juice and air rings is noticed so no leaks. The top has much coarser threads than a kayfun so it is easier to align and screw on the top.
I've ordered a few more to have in stock.