I have 2 Goblins, 2 Goliath's, and am Happy with both. Through constant use of them, I have learned to minimize any leakage from them, and can build them with 2.5 mm. 25 gauge coils.
When version 2 of this new thingy comes out, I will probably spring for one. Seems like all version 1's of anything are lacking that fine tuning, be it quality of machining, leaking, or poor filling problems. 25 to 35 dollars is the sweet spot for China made "decent" tank toppers, anything more than that - nuh huh, ain't stealing my hard earned cash for these trinkets.
p.s. I hope it comes out soon..