I'm impressed with all aspects of this mech mod. The overall fit and finish is excellent -- stands up to the machining of mech mods that cost way more. The button design is novel, using two attracting magnets rather than the usual opposing magnets (there are several videos on this -- check out Vaping Biker's one for a nicely done illustrated schematic of how it works). The throw is short and it gives a solid click when it makes contact. It has one of the best firing feel that I've come across. Performance is right up there with the best mech mods. An incredible value for the price.