These cables are nice because you've essentially eliminated the need for one header from every module. This is a great option you have only a few power connectors, very little space for a power bus, and way too many modules.
You can also make this sort of cable yourself by ordering an IDC crimper, cable, and 16P and 10P headers. But you probably can't DIY for less than what this cable costs you.
I use this in a 4ms Pod64X to add 2 extra connectors.