It seems to hold just one NVMe M.2 drive, if I'm not mistaken. I don't see the advantage over using two USB-NVMe adapters to clone data to a new, larger NVMe M.2 drive. It would be more convenient perhaps for backing up or imaging NVMe drives to a SATA drive though, or for data back-ups. At $83.20 ($106.62 CAD), it's not inexpensive.
Edit: I don't see how it's hot-swapable (they don't mention that it is). If it's not, -1 points for convenience vs USB.