V2 Vsavi Classic Blank Cartridges

These are my preferred cartridge for the EX battery since they are both a sleek fit and refillable. My only gripe is they are a bit of a hassle to refill, and getting the cap off is kind of messy and unpleasant. That being said, I also have the supposed 'EX blanks' which are easy to refill but are an eyesore and don't actually match the look of an EX battery. I think these are the better option for the EX overall, since the only other option is the non-refillable ones or the really ugly ones . These also have a better flavor and a smoother hit than the other two 'loose liquid' types.

Finding the caps on my latest order very hard to get off

Lasts ages, no problems with leaks, easy to fill, would recommend.

I've been using these blanks for over 2 years. The previous version was very good. I would be able to use these for a week before replacing them because of the burning taste still there after a refill. The new version that I got this month is rubbish. Why change a good product. This new version will last about three refills before the burnt taste is still there after a fresh refill. They are slightly shorter and they don't have the internal seal under the cap.
Response From Team V2: We are sorry to hear that you have been having this problem. We are not aware of any design change to this product although we have noticed that, on a very few, the removable bung for filling the cartridge is sometimes out of the cartridge itself. We have reported this. Did you contact us about this? If not please call us as soon as you can so we can resolve this for you.

I was finding that the pre-filled cartridges were stretching my very limited budget so I tried the blank cartridges. Once I figured out how to fill them I found them easy to use and very inexpensive to use.
I am now converted and can recommend them as great value for money.