Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A good grinder and a quick delivery time

I have had a Glastar grinder before and they are of excellent quality. This one is best for the hobbyist. I ordered it from the US to Australia and it works fine with a transformer. I will need to purchase a glass shield, as (even with safety glasses) you do get glass on the face which is irritating to the skin. The product arrived very promptly.The only criticism of the product is that there are not any decent instructions around the accessories, such as the straight edge guide. I will need to search the web.