Two issues:
1. It takes quite a bit of time to break in and get rid of the cotton taste.
2. It splits in the coil way sooner.
(Both of the above is compared to CB V2 and CB Prime).
On nr 1 it can be a few issues, including actual cotton taste and wicking speed that will affect that, will only be able to comment on that once I have tried the actual cotton.
On nr 2:
What coils are you using, ohms, power and spaced/contact?
What juice are you using, fruits, deserts, sweet/not sweet?
Do you wick light and lose or do you wick tight?
Why I ask this is because certain sweet juices at high power creates cotton collapse (the split in the middle) quicker. Also juice that contains high concentration of Litchi. A way around it is to switch to Temp Control, that will reduce your chance of cotton collapse. Also, if you are using contact coils, try spacing them and wicking it a bit tighter so you dont have empty pockets between cotton and coil for the juice to sit in.