I don't know why I never tried them when they first came out years ago. The last couple of years I had thought about trying them but never felt the NEED to have them. Thank goodness for the ICAD challenge. If it hadn't been for last year's challenge, I probably would just still be thinking about them and wouldn't have tried them as soon as I did. That is the only thing about this challenge, there are just too many things that I NEED to have.