My thinking was to have the Fiber-Fix for a quick "roadside" repair, then get down to taking the cassette off and using real spokes in "camp" or having gotten to a bike shop, though I do see your point as to it being a double fix (belt and suspenders?)
I've never used a cracker, so probably once I get proficient with it I wouldn't need the fiber-fix...
Thanks everyone for your comments, I'll look into the Unior aswell
This is my thinking as well. However, I have yet to break a spoke in 3 tours since I started having my rear wheel properly tensioned prior to the tour (knock on wood!) The Fiber-Fix spokes weigh almost nothing, and the two spare spokes on my chainstay don't weigh much either. I carry them both.