Great last kit. I used them at work on a car this weekend and they have been spotless, strong and sturdy. I'm not sure how people crack them, but my guess is that they exceeded the recommended load or drove them. While my car was on the jack, it shifted and landed on the blocks. I dropped my car right in the middle of the pile and it just stood there with no problem. My whole rear end was on 1 pad and it didn't flinch. Very nice set and at an incredibly low price!