This blades are wonderful after looking at several different sites I was so glad to find them. You don't have to handle the blade, just slide the old one off and slide in the new one.I am ordering an extra pack so I never have to use a dull blade again
I had mine about 4 months before I had to replace it. I felt it dulled pretty quickly. I did use mine on some hard core stuff, like cardboard for a tree on a lo, but only one time. The rest was just cardstock. I just bought another blade and will see how this goes. I love the ease of use and having this instead of standard scissors at times can be awesome.