This product does not so much crush garlic as beat it into submission.
The cutting edges simply aren't man enough for the job. It makes the whole process hard work, and it doesn't do anything that a good flat hefty bash on the flat side of a a knife-blade can't.. Aesthetically pleasing, it may be, fun gadget to look at, perhaps...
Useful? Up for the job and fit for purpose? It ain't.
Waste of money.