The refills are good value for money, and I prefer the flavoured liquids to the tobacco flavour ( which I find very bitter and gives me a sore throat)……… but please, please make the liquid cartridges see- through. I cannot tell when the cartridge is nearing empty, in contrast to the Epen2 which was very easy to read. I know there is a flashing light when the cartridge is empty, but this is when it is totally empty and this has left me several times without the use of the Epen until I able to get to buy more refills.