Interesting little gadget but I don't think it would become part of my tool repertoire. So far I've been more than satisfied using the coarse or fine sections of my microplane grater to end up with my preferred mince for garlic. In fact, if I want garlic paste, I usually pass the garlic over the finest part of the grater, then add some salt to the grated garlic and smoosh with the back of a spoon until I achieve the consistency of the garlic paste I want.
For years I've been using my old metal Ovaltine shaker to peel cloves. I just put the separated cloves into the shaker, put the top on and and shake vigorously. In no time the cloves shed their skins and I have perfectly peeled garlic. I saw a chef do this with a couple of small metal mixing bowls, one placed atop the other, then shake. Worked. Why wouldn't the same principle apply to another metal device, which I already had and used to make slurries for gravy, etc.?
In case your're wondering, here's what mine
looks like .
Before that I used a 6-inch section of pliable plumbing hose I bought at the building supply/home center store for, I think, less than a dollar. I'd seen the ridiculously costly ones in cooking stores and in catalogues and figured I could come up with the same thing for waaaay less. And I did. I bought a couple of feet of the stuff, cut several and gave them to friends, who use them all the time.
That's my story and I'm sticking to it.