I have the Garage Deck down in my shop. It is a less expensive version of Racedeck. Made from the same material and locking mech. but the undertile pattern is different.
I have been pretty happy with it. I do see some of what MikeyR has seen in the hot sun. With the sun beating down on the tiles, you get some expansion and lift. I cut a bit more out of the corners near the garage opening, but it didn't go away fully. You can really see the expansion as those gaps between the tiles really shrink down.
As for the tiles splitting when steering. I have had 2 incidents when pulling my Dodge 1500 truck in to the shop.
The first time, there was a snapping sound where about 5 tiles split apart while driving in. The second time, I was turning the wheel and when finished parking, there was a 8 inch rise in part of the tiles directly in front of the drivers wheel.
Driving straight in had zero problems. I also have the foam underlayment (laminate) under the tiles and there was very little weight on the floor on the whole and those things might have played a part. There was no damage after each incident and the tiles were able to snap back just fine.