What I do not like in these cartridges is the price trend. It's just a glued metal sleeve with a few drops of liquid. In December '13 I paid more in total 10,50 for the 5-pack. I've kept as reasonable. Now the price is, however, increased by a whopping 5. I think this is an outrageous price policy. Only throw the product cheaply on the market and then make with the refillable cartridges, the price seems to rise exponentially, money.
For me, it has thus become a disposable item, like a EinwegeShisha. This is exactly what I wanted to get around to avoid unnecessary production waste.
Still, I give it 5 stars for the product (and the taste) per se. Due to the above-mentioned reasons, but I find that it has earned a maximum of 3 stars.