Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great picks; improve your technique!

I'd like to preface this review by saying: 'I think purple is a pretty alright (cool) color'. These guys look sharp and feel great in the hand. When playing, the picks show no noticeable flex; this is awesome for developing good technique and control. With these picks, the musician is given much more control in general, especially in regard to dynamics. I certainly feel that these picks have helped to isolate some of my own technical flaws, allowing me to slowly correct bad habits. Hope this helps, thanks!