i have the clone and its only weakness is the springy metal thing in the switch. cant speak for the authentic, but the ones the clone came with break pretty quickly. been thinking about replacing mine with a spring or something, but havnt got around to it yet (they send two of the metal springy things and im on the last legs of my last one). beyond that, the design is brilliant. two solid metal parts, feels nice and heavy with a good grip, and its one of the shortest 18650 tubes you can get. i wouldnt hesitate to get one if the timing was right (its a bit out of my impulse purchase price bracket lol).