The Goblin Mini tanks by UD (or Youde) have been some of my favourite mini tanks. I have both the V1 and the V2, and I've loved them both. Have to admit that the V2 has been used a lot more than the V1, simply because it has top filling. In my opinion these are pretty much equal when it comes to building (takes some trial and error to get the right amount of cotton), flavour and of course capacity, but of course ... you don't need to bring a screwdriver to fill the V1. For me the filling mechanism on the V1 is the reason I haven't used it as much as the V2. Now, it's time to try out the V3.