It is a product inspired by a great idea. It is really universal and can fit any double pedal. The pads are quiet, but I advice some extra carpet be used as a base. As a pure con I see that I can't use it with my double pedals without changing the setup to optimize for the hammers, so switching just the hammers is possible, but it will bring a different feeling. At that you get perfect mobility, this can fit into the bag for the pedals without problem. I like taking it with me, when I go around vacations. The other con for me is the price, for two hammers and a plate that is bent the price is too high... I don't regret it and I will use it for the future. It can really help with getting good pedal control... also it is biased towards stronger spring tension.