My wife got me the Park Tools I-Beam Mini Fold Up with Chain Tool (IB-3) from Park Tools for racing last year and I never had to use it. Then while commuting to work a couple of weeks ago I needed to use the tire lever to change a flat and the one of the hex wrenches to tighten my seatpost clamp. Folded it up, threw it into the bag and off I went only to find out when I got home the nut one side of the post came undone and all the tools came off. Fortunately, they were contained within my seat bag.
When I got home, I went to the Park Tools website, told them about what happened, gave them my address, and two weeks later a new one showed up in the mail. Now that's cool! I love a company that stands by their products! Hopefully, this will sit in my seat bag and never be needed, too.