I’m always hesitant to buy a product that gets a “finicky to wick” review, and I’ve never been a fan of top fill because they are always prone to leaking, but so far, 1 week into using this, I’m super impressed! I watched numerous reviews and wicking videos on this device and I’ve got to say Rip Trippers video was the best. I took my time getting it wicked, using the Wotofo cotton, and I have had no problem with dry hits, or leaking, with only one exception, which was my fault, I filled it up too full. Make sure you leave just a little space in the tank before putting the top on and you should have no problem. I have filled with vents open and closed and it seemed fine either way. After putting the top on, I take one good hit on it and I’m good to go. Flavor really does seem more intense with the Unity than any other tank I’ve owned so far. This has become my primary go to setup.