Beer_Weed
Bluelighter
This thread is about grinders not vaporizers, lets try to stay on topic please. 

Or just save your money and get a vaporizer...
Original poster: your buddy sure got ripped off. Good quality kief grinders can easily be obtained for 30 dollars. Even so they're not as efficient as they'd have you think, because you're robbing bud of its trichomes. A vaporizer is much more efficient, high wise and money wise.
do such grinders make the ground bud noticably weaker?
im usually to high to tell