Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Works great
Review: This grinding cup works awesome for my application. I use it to smooth rough sufaces of all types of rock from soft to hard granite. The only reason I didn't give it 5 stars: it vibrates a lot. In all honesty this is the first time I've bought this type of grinding wheel. I do love the results + saves time = $
