I remember buying my first Silky saw when my supplier began stocking them (I operate a landscape company). I bought a fixed-blade unit to take to Alaska for cutting medium trees, poles and firewood. I bought the fixed, longer blade so had more cutting stroke. We've used it on live and dead spruce, birch, cottonwood and aged (hard!) driftwood. The Silky saw line isn't made for sportsmen...it's mainly for arborists and pros who use them constantly. That said, I think the Silky is as good as one-hand saws ever get. By the way, if you've never used a non-folder, you might want to think about it. The blades are usually longer, and the saw comes with a rigid scabbard to hang on your climbing belt or outside your pack. Grab it out and no fumbling required before cutting. Unless I really need a compact saw, the rigid is far preferable in actual use.
Another great line of pro saws is the ARS brand. Again designed for work and tough enough to hold up. I own a couple folders by ARS and they really good saws. My hunting pard has a rigid ARS saw and it's fun to watch him buzz through a 4" oak limb while in his climbing harness. These are real tools for serious wood removal.