Second- and third-copy products are generally not worth buying if quality, safety, and long-term use matter. In the difference between first copy and original, originals offer verified materials and reliability, while copies focus only on appearance. In first-copy vs. original products, even first copies already compromise on quality, and second or third copies reduce it further. For items like original vs first-copy sunglasses, lower-grade copies often have poor lenses, weak frames, and no real UV protection, which affects eye safety. When comparing genuine vs counterfeit sunglasses, second and third copies are imitation products. From a real vs imitation products comparison, these copies may cost less but usually fail in comfort, durability, and protection, making them unsuitable for regular or safe use.