These refills are very neatly packaged which importantly means less waste. They are also very easy to attach to the battery and are of a solid, reliable build. Compared to similar products I have tried I would say that the flavour of these refills are much smoother and less overpowering whilst still maintaing a decent menthol taste. They offer exceptional value for money - lasting a fair bit longer than others I have tried. All in all I highly recommend them and will continue to purchase.