Just my 2 cents here, but I ordered a sample. I cut it in half, snapped it together and poured a small amount of oil on the seam. The intent was to see how much would weep through to the concrete below. After just 10 hours, the entire surface under the tile was coaled with oil. Almost seemed like there was a capillary effect that drew the oil through the seam and dispersed it under the tile. Now I have some older cars in my garage along with the NSX and they do mark their territory. I don't think I could live with the thought of fluids under the tile for years.
I was disappointed, as I was planning on doing my 30 X 32 space.
I will probably do it with a commercial tile eventually.
Buy the way, the Cobra guys put together a group buy at around $2.50 / foot.