Some say that it does but, I haven't found any leakage issues with mine. It's different from other types of carto
tanks since it's a grommet type. The grommets are one there very tightly and that's the reason why it doesn't leak. Others like the Liquidnator depends on o-rings to prevent leakage. So, depending on the diameter of the carto. That will mean whether it has any leakage issues or not.
Also, the Chibi tank requires the user to use a syringe for filling. Which might or might not be a problem for some. I personally have no problems with it. When I want to change the carto. All I use is a small paper clip (have to put it in the middle of the grommet and polycarbonate tube) to fish the grommet out.
Anyways, if you don't have a problem with doing all of that. Then the Chibi Tank is great for the price and works just as well as any tank on the market IMO.