I just wanted to give an update -- I have received a lot of private messages asking me about this, so I figured this thread must still be getting attention.
I've had the floor for roughly 6 months now, and in general, no complaints. What everyone else is saying is true -- it should work great in certain situations. I get no direct sun in my garage, and I used a pattern that seems to help offest the very small size differences in the colors.
About 3 months in, I had buckling in two places, but that was at the very front of the garage -- I determined that the entire floor had moved forward the slightest bit (like one quarter inch), and was hitting one of the posts, and the cabinet wall. So I trimmed a little more around all of that, and it was happy again. I don't really know how the entire floor moved like that over the months, but I guess it must be when you have no cars in there, and then drive just one in, it must move a little. I typically always have 1-2 cars in, so it has not moved again. Just taking a guess at that is all.
At $1 per tile, I am happy as can be. My biggest complaint now is that after 6 months the tiles are dirty, and it is time for me to get my cleaner going -- I figure an hour or two crawling around, and it will look brand new again. I sweep it out all the time, but you get some dirt marks from the tires. The few spots I have cleaned up have come out good as new. Including brake fluid and oil on some tiles for 10+ days -- the joy of a vintage car.
Summary -- Very happy after 6 months, would do it again in a second. I am happy that I bought extra so that if I do extend the garage to a 4th bay, I can match the floor. Perhaps in the next house, the only thing I might consider would be to use a flow through style tile for where the cars park -- that would be pretty neat for the water run off and even for the dirt (if it was easy to pick it up and sweep under it once a month or something).