I'm giving vype itself a 4 star as their products a whole are generally top quality. However I have recently purchased the epen 3 and I was very disappointed with this product. The idea is excellent but compared to the taste and flavour of the etank pro 2 which I also have it just doesn't even compare. This really needs work. And it is too expensive for what you get. 2 refill cartridges for the epen 3 are £5.49 which will last around 2 maybe 3 days at a push. A single bottle of 10ml e liquid is average £4 which will last 4 or 5 days. Not ideal at all. Like I said. Fabulous idea. Needs more work.