I just received an order from Totally Wicked and their atomizors bring the two piece cart. I now have the original completely round, the flat mouth piece with the wick to one side, the flat mouth piece with the wick in the center and now the two piece. Thats four types. Does anyone know of any other type? Which works best for you? I have found the original round holds the most eliquid and by putting a tiny hole in the side at the top of the poly it seems to wick well. This not recommended for ecigs carried in pockets as it can leak a little, but at the USB comp it seems to work pretty good. After 7 atomizors in one month dripping, I am trying to use the carts more to see if I can get more use off the atomizors.