Practical but...
The cloner allows you to go from 2.5" to M.2 (and vice versa), but not from M.2 -> M.2 without going through USB (LDLC could present this kind of product in the future?)...
It can clone "on its own" without using a PC, but the downside is that it can only do this from disk A to disk B, provided that storage A < B (doesn't work if the disks have the same capacity, in my case from 2TB -> 2TB, it didn't work... I had to use my PC.