One of the two only plectrums I can actually use without complaining, the other being the Green Dunlop Tortex.
This pick is fantastic, lovely grippy texture that helps you hold onto the pick even when your hands become sweaty.
In my experience, on electric guitar its easier to go faster with a hard pick like this, and on acoustic guitar, it helps give a slightly darker tone than a thinner pick.
If you're new to guitar, I recommend that you buy a few of every type of pick so you can find the one that suites you best.