Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worth having to re-buy every year or two

I first got one of these back when I was in HS. It's the only thing that really curls my hair aside from sleeping all night with things in my head that hurt and ruin my night's sleep and rip out my hair. It's so easy I would use these every morning. Now that I am older, I use them when I want my hair to look good. Best just to put some shape/body into my hair.The downside: these things get clogged after a year or two of use and I can't figure out how to fix that. They one day just stop producing steam. I just decided to buy my third set, but I'm still really glad that I did. Sure it may cost you $40 or so every time you buy it, but when used over a couple years, that's not even as much as you would spend on hair products in couple months, let alone haircuts, treatments, etc.For the job it does, it's well worth it to keep buying this product after it wears out.