I use the oval one to replicate flame cut armor. You can use the rounder part and the sharper part to give differing types of "cut".
That's what I did for my current Super Pershing project. Hard to see cuz I used Evergreen.
http://www.network54.com/Hide/Forum/thread?forumid=110741&messageid=1052542477
Most of the edges have the "flame cut"