I'm with LED. I've waterproofed the Diamonds with clear nail polish and I've never really had a problem. I thought quality would be a problem since they were three boxes for a dollar but that didn't prove to be the case for me. Once in a blue moon I get a match with little white phosphorous on the tip which makes striking difficult, and very rarely do I get one that just "pops".

My best advice though would be to supplement your fire-starting capabilities; take along several methods. Take along a lighter, a flint/magnesium striker, and maybe even a small magnifying glass and you should be fine. Practice, practice, practice with the last two techniques though. It's better to learn in the backyard now than if you have to do it if something goes wrong.