I enjoy Vype very much but find that the cartridges don't last as long as some other brands I have tried and therefore it can work out quite expensive. The Intellicig cartridges were x 5 to a pack and cost £3.99 and the Vype are considerably more expensive for less. This would be a reason for me to stop using them in the future and search for a cheaper alternative. Having said that, the Vype is very superior.