I have cut myself already using my rotary cutter. Not bad but enough for a bandaid. I didn't get a klutz glove after that though.
My dear sister-in-law almost cut off the end of her finger with her rotary cutter and had to go the the emergency room to have it sewn back on. She even did not buy a klutz glove after that. But I did! Hearing her story made me scared enough to go spend that atrocious amount of money to go buy one of them. (I did use a 40% off Joann's coupon to get it though!)
I use it every time I use my rotary cutter now. I figured that after I spent that much money for it, I might as well use it! And the first time that I don't use it - THAT is when I will cut myself!
I am not sure how much the glove will protect my finger if the rotary cutter runs over it, and I don't want to find out. But now that I have it, I will use it and hope that it protects me somewhat.