My daughter has these, and likes them. She is preparing her Senior test program, and working on Pre-Silver dances. They are definitely lighter, and hold a sharpening longer. At the moment, one of her coaches takes them out of town for sharpening. I talked to the guy at the Paramount booth at Adult Nationals, and, while I had trouble understanding what he was talking about since I'm totally technologically challenged, it seemed like the main thing needed is an attachment to the sharpener that can hold these blades properly. It's apparently an easy piece of equipment to get, but I've been told by some people that they don't see enough Paramount blades to make it worth their while to buy the thing. We bought them because they extend the time between sharpenings - she only needs it every 2-3 months.