Ok, so I got a Duo Clean tank from the classies and I really like it but it's fiddly. I like the way it looks on the Twist and Provari. I don't like it that when I take it apart to clean it well, it's a PITA to get all of the O rings exactly back into their proper locations. If the O rings are even slightly askew, the tank leaks. It is easy to fill and refill; just pull out the drip tip. It's a nice looking tank, but at that price point, I wasn't even going to consider purchasing it new. Phiniacs are still my fave glass tank.
Here's a pic from the website.
And link: Duo tank
badass...
pricey...
and i want one...