Looking for people who are familiar with the ego-w, trying to do my own searching online and on this forum and cannot seem to find the answers i'm looking for. Is the ego-w standard carto it comes with suppose to last longer then lets say boge carto's? I like the style of the ego-w and don't want to buy a tank that wont be able to work with the tank sleeve/pen cap. The standard replacement carto for it is much more expensive then standard boge carto's which brings me to think i don't need to replace it as often, is this true?