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Title: Great...when they work. So not great.
Review: We have wasted a lot of money on these things. When our oldest received a Hot Dot pen and math flashcard set, she loved it. We were so impressed we went out and bought more pens and sets for our other children. We also bought the Hot Dots junior pen. Each pen broke. Having made an investment in the cards, we went out and bought more pens. Those broke too. So we bought more. Yep, broke. They work for awhile and then gradually start saying every correct answer is incorrect. Talk about defeating the purpose! I'll probably keep buying these darn pens to keep the flashcards from being totally worthless, but if you haven't started the cycle, don't!
