So, what is the difference between them all? Is Dyanmat, which seems to be the most popular, better, or thicker or whatever, against Smittymats, which seem cheap? Has anyone out there done an actual side by side comparison? I have seen articles on Dynamat, and the praise of the product, but how does it compare to the others? I don't mind paying a few dollars more (okay, so I really do), if the item I get is actually better. But i don't want to pay twice as much if I am getting the same result. Any opinions from anyone that has used more than one of these items?