Adam,
Thanks for the input. It's always helpful to hear weigh the pros and cons so that we can utilize tools/equipment to their fullest.
I'm not terribly concerned about the longevity/durability of the fiberfix…For me, bike-packing is often an extension of cycling rather than an extension of camping/backpacking; Because of this, I rarely find myself riding rough terrain (I stick to highways,roads,limestone paths) but I'd imagine there are many others who will see your post that don't fit my style of bikepacking.