I realize this post is almost 3 years old but I am just going through the forums and saw it. Yoga and Q didn't exactly steal the idea behind my original slipmats (although they did screw Matt over who designed the original butter rugs) but they did take the original butter rugs that had the plastic bottoms to slipmat source and ask if he could reproduce them. Unfortunately, it was labor intensive, so they opted for cheaper mats.
I will say that it was a huge coincidence that the next gen of butter rugs had the same material as mine on top, but then again that was what? 24 years ago.
Anyway, I'm back to making beats, later!