I was somewhat skeptical of this product, for it sounded too good to be true. Plus its commercial made it out to be some type of ginsu trimmer head, cutting through metal and such. I was desperate though, I bought a new Echo trimmer several months back with a speed change head. When trimming my chain link fence, I literally had to change the line every 5-7 feet. It almost rendered the trimmer useless.
So I purchased this Pivot Head. Looking at the instructions, which were somewhat useless, I actually had to pull out my trimmer owner's manual to figure out how to pull off the original head. The Pivot Head actually seemed in many ways inferior to the original head I just removed; it was much lighter and made of less quality material. I almost didn't even install it. Glad I did though the whole install only took about 15 minutes.
Upon first using it, it took a little getting used to, in some ways it has a little more give to it than traditional heads. It worked great, I was able to trim, and edge my whole yard without changing lines. It worked better than anything I've ever used along the chain-link fence; it even got between the links. Great product, I would recommend to everyone.