The rocket is what it is, a kayfun clone who's quality is reflected by price. No doubt, now that I have posted this, someone will appear to say just how brilliant they are. As a 'cheap' kayfun clone, the Rocket is as good enough place as anywhere, to test the waters and get a feel for a rebuildable tank and get to grips with your coil building and wicking skills, but I would not expect it to become your 'go to device'. Machining is not great, and they have a tendency to leak from the top cap o-ring. Get past this, and they vape as well, and as consistent, as any of the other clones. It's horses for courses, but, in my opinion only, paying a few quid more for one of the better quality clones, hcigar/svoemesto etc is the best option,if your budget does not stretch to the genuine article.