I use them and like them for pinning through thin layers. They bend easily when trying to push through thick layers, and sometimes the heads fall off when pulling them out of thick layers. I have the blue Clover pins and they are very sharp and fine, I love that! I think I like the glass head pins the best, I haven't bought any yet, but have a few "borrowed" ones from different classes. (someone teaching me something and the pin went home with me) They are super sharp and thin too, and I think they would be more durable in the long run. My "heavy" pins are the round head ones that came with the magnetic holder, and they seem so dull and thick after using the flower pins, but they are great for thick layers and sewing clothes.