I only owned a 6x24 until a few days ago. I was working on miniatures, and ran into a problem, contacted Rhonda and she sent me a special order template and included one that she made that is 2x9. You can't imagine how much easier it is to use on miniatures! If you are interested in templates for miniatures, here is the link:
http://www.quiltingboard.com/t-144668-1.htm
In the future I am going to collect more rulers of varying sizes as I need them. The 6x24 was great to start with, but I can see how a square or some of these other specialty sizes can be very helpful!