if you like grinders, then yeah... but if you like breaking it up with your fingers you wont use it much
I've heard good and bad reports about SharpStones. I have never heard a bad report about SpaceCase's or Cosmics.
Sharpstones are iffy, my friend has one that he got one year ago. It is pretty much dead, it did get used A LOT but still now the kief catcher won't work, some teeth broke off. My spacecase would never. So for the price sure but you get what you pay for.