This great little product is a boon to drummers who want to add more cymbals to their kit without taking up space. It works, and is made perfectly, as is to be expected from Gibraltar.
Using either the 4" or 6" stacker, one can put splashes over crashes, bells over trashes, small effects cymbals over trashes over rides. The possibilities are endless. Just make sure smaller cymbals go over larger ones.
Be warned though, upon trying one for the first time, you will want to buy one for every cymbal you have, so small is the footprint and so effective the result.