Does anyone have any experience using a fire piston? I saw them on an episode of survivorman and have been looking at them online, but I would like to get some input from someone who has had experience using them in the wilderness. I'm probably going to get one anyway just for fun and to mess around with, but is there a specific website I should order one from? Ive found a few websites, but since I have no experience in this product, I don't know how to guage the quality of the product. Any input would be helpful. Thanks in advance!