Morrowj- that easy open is lovely. I've never seen one like that- very nice. I'm a fan of this pattern as well. I have the Case equivalent of the #11 and it's one of my favorite Cases. Heavy cardboard cutting is pretty much out- I wouldn't use it for anything that required using a lot of force, but for piercing and slicing it's great. And it's hard to beat for purity of line, ease of carry, and feel in the hand.
When I carry the slimline trapper, I carry it in my back pocket, in the same pocket as my wallet. The wallet holds the knife up, so it's very easy to grab quickly. When you want to get your wallet out, you just hold the knife down with your thumb, and it stays in your pocket. The slimline trapper is one of the easiest slipjoint patterns to open- just pinch the blade and pull 'er open. I never bother with the nail nick.