Ok...I wanted to use overwriters for a project. I normally never use those fancy markers but I ended up with a buch so I thought I might try them. I could not get them to work!!! AM I stupid or do they just not work very well? Also, how are changeables different from Overwriters? Maybe I should try those instead. The thing is...those fancy markers tend to be very expensive and run out quickly. You need a lot of them for a class!