Dunlop's classic positive attack, mellow tone, Lexan plectra. These are the heavier, rigid picks. Perfect if that you're looking for a percussive attack but with a rounded tone, and if your technique leans towards precision.
However, its rigidity means that there's sometimes a distinct acoustic *tink* as the pick hits the metal string. That's fine if you play electric (like I do), but may not work in a lot of acoustic guitar contexts. Also the grip could be better as Lexan can be slippery in comparison to other materials. (For those wanting the weight, but without the contact noise, and if you need a better grip, check out the nylon Stubby as an alternative.)
But for me, I've been using these for over twenty years, and despite periodically trying other plectra over the years, I keep coming back to these. I love the sure attack that you get from using a rigid pick, and the tone available because of the sculpted shape.