I have received these picks and also the older thinner model in a larger pack and tried them in different situations. They work great when strumming on acoustics, but for that, the Attak Pick is even better. But I find these perfect for hitting hard those chugging power chords... I will use them whenever I will need a good "hammer in your head" aggressive chug! And I will try them more on the acoustic, specially the thinner ones.