Fantastic quality, I'm an engineer and i cannot fault the workmanship. Chinese engineering is very good these days! However..., i could not fill the bottle using the standard gunpower charging adapter, i tried many many times and wasted lots of air! As soon as you bleed the air from whip it just empties the entire bottle every time, very frustrating. I tried many things, including stronger valve spring, only to eventually work out that the valve is made too long!! The 'top hat' presses against the top of the charging adapter so the valve is always open!! The only fix for this is either shorten the 'top hat' or make a 3mm sealed washer to go over the valve and sit on the base. But it has to be sealed with an o ring in order to work. This valve is also NON adjustable, unlike the standard valve. The only way to adjust and tune would be to make a series of sealed washers
Good item and quality.