I've known them for years. I've seen others use them, and although they were a gimmick. I finally tried them after reading a trustworthy online review. They work really well. Especially on outside corners that need time for the glue to set. I'll try them with blue glue to speed up the process. Not a big learning curve. The kit includes pliers and 4 spring clips. For larger works I/you need more than 4 springs. And yes I would buy again. TIP: Use a $1 hardware store carabiner to secure all spring clips in bags/boxes.