Eventhough it comes off the wall about 1/4" to allow for expansion it still buckles if you have "stuff" on the floor. I have a drill press, floor jack, metal shelving that sits on the floor, tool chests, and CARS that hold down the race deck...it buckles. HOWEVER, if your garage doesn't face the sun or you live in cooler weather then it's a non issue for you. Lastly, if you should ever decide to get a rolling mid rise lift then it won't work on the racedeck as the heavy rollers will pierce the plastic. Jack stands will do the same.
Some other things to think about before designing/committing to the cabinets:
lighting (love my 8 ft' fluorescent lights), additional outlets, and hylofts (ceiling drop down metal shelves). IMO, it's a waste to put a few huge suitcases, Holiday items or any other rarely used items in the cabinets. Since they are so bulky it's easier to store in the ceiling shelves. I have both and have no regrets...can park 3 cars in my 3 car garage.