I love this set of picks for many reasons and I frequently use them in various occasions, such as rehersals, live gigs and so on.
The best thing about these picks is that they are extraordinarily light and the sound is very crisp, even mantaining a good grip on the finger. Plus, they come in all sorts of colours and the price is unparalleled. Excellent if you play a lot. I love them on all kinds of acoustic guitars.
The only downside to me is the fact that over time and use the tip begins to be somewhat too much rounded, but it's frankly quite normal and, given the price of the single unit, you can change it without any remorse.