The closed system approach - dictated by EU regulations for 2016 - is somewhat restrictive, yet if this means that we can improve the safety of e-liquid and vaping then this might be a good thing. Thr Vype e-pen is simple to use and delivers nicotine reasonably effectively. Faint praise, yet this is what the EU regulations imply. The product functions and is very easy to use. The replacement caps are NOT overly expensive when you consider that a single cap lasts a whole day and you are not having to pay for atomisers. For example, I can get through 4 ml of quality e-juice in a day using a sub-ohm tank (my current preference) - this works out to be around £2.30 a day (as a very rough estimate and factoring in a replacement coil every three to four days). A Vype cartridge costs £2.33. The vaping experience of a Vype is certainly not as involving as using a tank system, yet maybe it is safer? Without BAT publishing actual data, we will not know. The sooner they do this, the better.