i've seen the sistrum racks but never used them. i do own zoethecus. the two brands of racks are so different from one another in construction and approach that i should think them virtually impossible to compare. that is, unless you do as redkiwi has, testing many combinations in your own, familiar system. i doubt you really have that in mind. i also doubt that the sistrum will provide the performance of zoethecus, tho i have no emperical evidence to support this opinion. i do, BTW, like the design of the sistrum; too bad the musical motif is covered in use.