Is this grinder any good???

[Zcomp]

I've not used a plastic kief grinder before, but I own 2 or 3 plastic grinders of all different brands.
Never have I had a problem with the acrylic "grinder teeth" falling out, The one way they would "fall out" is if you were to smash it with a fucking hammer, not by grinding herb.
It's the grinders with pins as the teeth you have to watch out for.

Funny you should mention the pins. Thats exactly what I have. And exactly what I was referring to. The pins, Not the little pyramid's is what breaks(usually on a twig).
Except the one I have... Its heavier than any other I've had. And for 2 yrs now its been used for grinding herb and twigs. Its so strong that I scrape off the jammed kief without even scratching the plastic.