That's a great idea, but it doesn't answer the original question:
Is the Kreg Rip-Cut Circular Saw Guide any good?
While just about any homemade straightedge will work (some better than others) it still requires that you clamp the guide perfectly straight, etc. Doesn't the Kreg guide come with the advantage of a built-in edge guide to ensure parallel edges, especially for multiple cuts of the same size?
Of course, the more important question is: Does it come with any built-in *disadvantages*, such as not really following the edge, i.e. drifting, poor saw clamping mechanism, hard to use ruler, etc?
I'm not pushing back on any of the tried and true straightedge methods, many of which I've used for years, I'm just wondering if the Kreg jig offers any advantages for repeat cuts considering it's only $30.
The first thing that comes to mind is it's size. For those of us with small shops and limited storage, storing an 8' guide is problematic.