Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Seemed really good but started pulling hair vs cutting it

I've actually purchased two of these over the years. Had one for at least a couple years and it was wonderful. But I noticed that it started pulling my kids' hair now and then which, naturally, would upset them. And when they don't enjoy getting their haircut much in the first place, this is annoying. So I thought it was because it was old, so I bought a new one. And right away it was doing the same thing. So then I thought it was because I was going too fast. But it still will give a quick grab and pull on the hair now and then. I don't really know why this is, but it's the only thing that prevents me from giving it 5 stars. It's worth buying, but only because it's the only hair trimmer with vacuum built into it on the market.