Instruct: Classify the given Amazon review as either positive or negative.
Query: Disappointing

I bought these clippers to do a maintenance trim on my Lhasa Apso. He was groomed last about 1-1/2 months ago and his fur is about 1/2 inch long, clean hair, no tangles, and no mats. Sad to say these clippers became bogged down in his hair immediately and would not go through at all. They were absolutely useless. If I could give a lower rating, I would. I was very disappointed in the (non)performance of these clippers, which I bought based on the "Oster" brand name and the information on the back on the package. Fortunately, I was able to return them.