Instruct: Classify Amazon reviews into positive or negative sentiment
Query: virtually useless

I got two Kunz spoke shaves last year, a round bottom and a flat bottom. The flat bottom is fine, but this one chatters so badly that it is useless. I even went to the trouble of epoxy bedding the blade and making a heavier chip breaker. I think the blade is just too thin. I guess you could buy an expensive blade, but it would cost more than the entire tool. I would not buy one of these again.