The What-A-Saw reminds me of the Sven-Saw http://www.svensaw.com/
that I used on canoe trips and camping trips.

Now I have a Felco pruning saw http://www.felcostore.com/order/f611?referer=saws which doubles as a snow pit saw, which is my primary use for the saw.

What I found is that while a saw with a frame might be more stable the frame limits the diameter of the wood you can cut and the angle at which you can cut. A straight saw with the same size of even shorter blade will cut larger wood at a wider range of angles and in areas with limited access.