I picked one up a few years ago. While I don't plan on using the kit as is in the near future, I regularly carry individual pieces of the kit which are scattered through my other gear right now. The compass was a Silva baseplate compass (not sure which model). Right now that one is in my EDC bag at work. The whistle is in another kit. I frequently carry the Camillus knife, though I usually carry a Swiss Army Rucksack at work. Also, since retiring from the military, the green space blanket has been replaced by an orange one from Adventure medical kits (I'm more interested in being found now).
One of the first things I do with those military fishing kits is to open them up and check the needles. I also take them off of the cloth that they are stuck on. I have the same theory has Don, that the cloth holds enough moisture to rust the needles. The only other place I've seen rust on the military fishing kits is on one of the metal containers itself.
All in all a good kit, and I'm tempted to get another.