Amazing followup after I posted an unsatisfactory review.
I posted the below review, Peter immediately followed up, explaining that the different spacing on the pieces are INTENTIONAL. They allow for users to adjust alignment down to the millimeter by aligning the pieces with different spaced pieces. What I thought was a problem is actually a genious way to greatly improve the functionality of the product. Thanks, Peter!
Joey
The silicone matt set up works OK for quite a bit of the work I do. I find that the pieces don't always create a straight line to register work piece against. Not all of the pieces are identical, so they sit at different spaces across a line of holes in the grid