It's more like raid with 2 data disk and 1 parity disk, or a 3+2 if you would rather... and there is the option to add a journaling ssd and/or ssd writeback cache. You also can set it up in mirror or with no resiliency like jbod. It's also the only official supported way to use refs on Windows 8.x. When it works right it's not too bad. My problem stems from having to reinstall my OS after the ssd failed and the new install absolutely refusing to import the existing storage space. Which is pretty annoying since one of the benefits it's supposed to have is easy to move disks from instal to instal or even to different hardware entirely which can be problematic with hardware raid.
