I love this product. I was an avid user of Brilliant but always struggled with its rigidity. I might have to do 1 hour of study to get the 5 minutes of info I wanted to learn and focus on. In looking for a tool that would let me improve knowledge but on topics and in a style that was more tailored to my current needs, I came to Polym. Achieves all this in a great package. Bravo, guys!