The paeans for Festool's guide and saw system in Charles Mckinley's thread make me wonder. I use the shop-built guide and saw system pictured below. The guide is two pieces of plywood glued together. The right side of the guide is exactly where the saw blade is going to cut. The saw rides on top of the right side of the guide, with the left edge of the saw's foot guided by the edge in the middle of the guide. Simple spring clamps hold the guide to the sheet goods.
So, Festool fans, can you give me good reason to abandon this system in favor of a Festool guide and saw?