Definite improvement over the original tank, because, lets be honest, they look awful! But now it llooks so much better, these are what they should of come with in the first place! So much easier to unscrew than the old ones too now i have got something to grip without worrying if it will smash in my hand... Cheapest price i could find for them on here too, and i must of searched over 20 sites! They are even only 50p more expensive than off fasttech! Great service and unbelieveably cheap price, which is why i bought two, one for each of my nautilus miinis! Thanks VapeLand!