That saw looks very neat but I've never used one. I think I remember seeing in the W&SS some that had one. He loved it until the aluminum frame cave way undeer stress and the tensioner pulled through its mounting hole. Let me repeat, I think I remember this.
That said, I have used a folding saw similiar to a Gerber/Fiskars and I liked it very much. They are compact and are easy to use. They don't take much time to unpack, just flip it open, and bite well into limbs and such. The only problem that I ran into is the relatively short stroke of the blade but all pack saws share this.
I also have a pocket chainsaw. This is a little terror on wood. It is very compact and can fit easily inside the space of a tuna can, the small ones. The saw cuts in both directions but because of this it can be exhausting. The other drawback is that the handles are quite bulky but any sturdy stick will suffice.
