OP isn't on the forum, but I'm kind of interested in one of these - mostly to safegaurd against potential failure of the original power supply for vtools. Especially because my intent there is to ultimately be running 8 SATA hard disks (and the attendant four SATA cards). (This will go along with a re-casing.)
So, part of it's to avoid moles to SATA power adapters, and part of it's for reliability, and part of it's to make sure I have sufficient power for all the cards and disks I intend to run.