They make a real nice sound. It is very different than the plastic ones. I believe it will last forever, 12 are plenty. The only thing to take care of is that if you use it then you will need a pick-guard as it can easily scratch the guitar. If you have a pick-guard then don't worry about it.
I wanted to try picks of different materials than the normal plastic, so I went for these steel picks because of the price point.
The picks are overall very good and the sound is awesome, I really like the fast attack of metal picks. They are definitely durable, I mean, it's steel! And they are very thin, you don't feel them at all, very nice.
The only drawback is the almost total lack of grip. I will have to find a way to stick/attach something to not lose them while I'm playing :)
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