No, I haven't used them. The red/blue one I gave to my Grandma. When I gave it to her, she asked me to make her another one so she could use one and put one away as a keepsake. She's sentimental that way, so I doubt she's used the one I gave her.
I just finished the orange one last night and I'm trying to decide what to do with it. It will be a gift for someone. I sure hope it doesn't bleed.