I have one too and love it! Has a small crack in it, but hard to find a replacement, so I'm gonna keep it as long as possible.
mdall: Have you ever used a large t-square? If so, you know how there is a lower ridge on the one end so that you can snug it up to whatever you are working on? Most other rulers have a completely flat surface on both sides. With this ruler, you can "hook" it to the edge of your cutting matt and then just line up your measuring lines for rotary cutting your fabric. You don't have to worry about it moving around. It's 24" long and 5" wide. Mine is about 12 years old already and I wouldn't trade it for ANYTHING!