I saw this on ebay:
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&rd=1&item=110157856576&ssPageName=STRK:MEWA:IT&ih=001

and a couple of videos showing them quickly making a fire using one of these pistons (less than 30seconds) and a tinder bundle. Seemed kind of cool.. (I thought so at least) I was wondering if anybody has made or used one of these before? If so. How did it compare to bow, drills, flint, and other less-than-modern (eg. lighters) methods?

P.S. if anybody else is interested in trying. I found pages on howto make one (if not already covered somewhere on this page)
http://www.onagocag.com/piston.html
http://www.garagegrafix.com/centerfinger/how-to-make-a-fire-piston/