Left: type A , Right: type B

Joye eGo tank atomizer- uses a clear tank cart which makes it easier to view the level of e juice left in your carts.  There are no filler involved.  E juice automatically drips as you inhale through the tank mouth piece.
type A holds approximately 1ml e juice
type B holds approximately 2ml e juice

I myself personally did not really like the Joye eGo tank type A in the beginning.  The flavors go mute at times.  Sometimes there leaking problems if the wick inside the atomizer was too low.  Then it was hard to drag when the wick was too high.  You will have to adjust the wick to solve the problem.  Doesn't that seem like alien language to you.  That was a reason why I did not recommend this to newbies.  Also I think it is kind of hard to maintain comparing to the regular 510 atomizers.  Usually I rotate 2 eGo tank atomizer every other week, and cleaning them after a week of use.  They normally last me no more than 1 month.  They cost from anywhere between $10 - $15 a piece.  My boyfriend still love them though, because it was easy to use. 

Recently I used up all my type A tank atomizer so decided to buy the type B atomizer to try.  I purchased a few, tried them all.  It was so good.  I mean great!!! Awesome!!  The flavor was great, so far no issues with the type B atomizer I received.  Type A does look prettier, but then type B holds more juice, that means less refill less mess!  I will report again after a month of use and see if things keeps up.  If it does I might be using these instead of the cartomizers or clearomizers.  Recently I been having leaking issues with my GPSSR so i might be considering to switch to the eGo Tank type B if it keeps up like the way it is.