Matt, All the replies being similar, the common thread is that the best training exercise in the world is fruitless if you don't come back from it. I am not saying that would happen, but it can everytime we all step into the woods (or wherever).

I have spent time on scout outings sitting around trying to light fires with flint and steel. It takes practice and I am glad I could fall back on a dry sleeping bag. By all means limit the use to your EDC/PSK, but either have a backup system or a person to bail you out if the bubble goes up. That is why we equip ourselves in the first place, right?