I don't happen to have one, though plan to get one some day. However, I love the organizing system that goes with it. I first learned about it six years ago when I attended one of the SR organizing classes at an expo.
Whether or not you decide to get a SR, I highly recommend the "4-section" system of organization. It really helps you use all your supplies and not forget what you have.
My supplies are stored in an IKEA Expedit unit in big cube boxes and according to the 4-Section system.
Best part is that the organizing classes are free.