I've only been using these for about a week and a half now but I am phenomenally impressed. I have both the E box kit and also the vape tank pro. Both are incredibly well-made with a really pleasing soft touch field to the exterior. The metallic parts of each of the items is incredibly solid and they feel reassuringly weighty in the hand. The E box kit is superbly well built - this feels like a really expensive product. It is simple, solid and elegant and what buttons there are and what moving parts it has feel secure and solid to the touch. In terms of its vaping, it's the best that I have encountered after about three years of trying other kits. The liquids are incredibly flavoursome and actually taste like they're supposed to. Apple taste like apple. Mint taste like mint. The only possible quibble I might have is that I have a feeling that I need to change the coil on the E box kit after only a week. However I have been using it quite a lot ( pretty much all day every day) so this isn't necessarily a legitimate quibble. Even if it were,a new pack costs £10 for five which works out to a couple of pounds a week -which is still pretty reasonable for a really satisfying vape. Overall I'm absolutely delighted and I just hope that the quality continues.