These picks are very good suited for speedy picking.
I play fast metal riffs, and most pickups just end up sounding pretty scratchy when you do the fast stuff.
They are solid and hard, with a sharp point, which makes for a clear attack sound without loss of speed. No flapping, like with most Dunlop picks, which I find pretty annoying for anything but acoustic guitar. They also seem to not wear down at all, which is surprising. Most picks are pretty quickly gone when you play 167 bpm speed- and thrash metal, but these almost feel like they are made of metal, but without the clangs that e.g. a coin would give.
None, really, unless you mind a cannabis leaf on your picks, which for some people might give some annoying questions from squares or parents.
All in all, they are well made, nicely shaped, great picks, for a good price.