If you do a search on the board for the official product name "ScanNCut", you can find several discussions. I would do an additional search on "Scan and Cut", not the official spelling, but often used.
In general, the computerized machines, like the ScanNCut, which cut a single layer of fabric and are wonderful for applique. Die cutting machines, the GO for instance, cut many layers at once and are better at pieced blocks.