I'm not a professional, but I've been doing my nails myself for at least 3 years. I've tried various products. I don't know why they have received so many bad reviews. For me, they are perfectly fine! In fact, they have more useful shapes than others that are more expensive. They have made the preparation of my nail plate and the skin / cuticles very easy! I believe that every hand is simply different! Maybe they don't suit everyone! Also, for a professional who uses them more often, they might wear out differently! I don't know. For me, they are great, really! ?