The other problem I encountered was when one of the two bolts by which the extender is attached broke, rendering the extender useless. The bolt itself was a little loose and the extra play caused the bolt to shear easily. An easy fix but a nuisance nonetheless.
-Otherwise I found the concept of a minimal attachment combining an already carried piece of equipment with a useful tool (making the tool even more useful) more than a bright idea. Backcountry skiers and snowboarders are always looking for ways to increase fun and safety without increasing their load. Just make sure the extender is bolted tightly to the saw, and you might want to carry an extra bolt or two in your repair kit.