personally i dont like grinders i like to break my pot up myself if i want to make hash or just smoke crystals i screen it and do it like that. Since i still dont know how to make bubble hash. "crystal catchers" are just smaller version of the big screen which is the old fashioned way of making hash. The pot will tasta the same anyway and its pretty fuckin hard to tell the difference in strength if the pot loses a little bit of crystal, most of the crystals are still on the bud.