If there is anything a pruning saw can do well, it is cutting fast. You might also try a Swedish bow saw. They are pretty quick as well, although they can't get into confined spaces the way a pruning saw can.
The great thing about the PS10 is its very small when folded and easily stored and forgotten about weight wise. Im betting it can fit in most larger Survival pouches which is a major bonus. It wont cut threw much more then a 6 inch log comfortably but in a survival situation Im positive it will serve its purpose well. Tomorrow Im definitely going to attempt to tackle as large of diam I can. Happily I can state the plastic handle is comfortable and has no "hot spots" as of yet. It provides great grip one and two handed and Im positive id prefer this smooth plastic over any form of rubberized or rubber slabbed grips.