I'm using a kanger mini protank 3, and I love it.
The airflow is a bit odd though. At first it seemed really loose compared to the tank that came with the MVP, but after taking it apart and putting it back together, it is tighter, even though nothing seemed to be loose.
Good vapor and better taste than the tank that came with it, imo. It has a pretty low volume. I have heard 1.5ml, but I measured it with a syringe to be about 1.0ml for a comfortable fill. I like that though, because I like to change flavors often, and the mini 3 does a good job of not retaining flavors between swaps (shorter wicks since it is bottom-fill) unlike the default.
Plus, you can vape until the last drop and not have to ever swirl it around.
Was worried about cooler vapor, but I can crank up the voltage a lot higher without burnt hits, and can actually get it hotter than the default top coil.
Rarely leaks.
Only complaints are that the airflow isn't consistent, and the mouthpiece is kinda odd, I miss being able to turn the mouthpiece to an angle.