Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Great buy

This is one of the best purchases I have ever made. I run around sucking up dog hair and kitty litter from corners everywhere! I only wish I had a holster for it! :) Buying one for my dad for Christmas. Only 4 stars because it doesn't pick up much heavier items than hair, fine dirt, & kitty litter. But that's what I needed it for, so works for me!