I bought a pair, around 500 sq ft of feet of precast 5/8 bamboo flooring. As another reviewer said, I have to thank Revain.com for their service. One arrived damaged and Revain.com quickly replaced it. Hats off to them. The quick clamp function was good when I had to rotate 180 degrees to align and install custom tabs, and the jack function is invaluable for setting up planks when I'm so close to the wall that I can't even my T&G air can use nailers . They paid for themselves the first time you used them. Definitely a must have if you are planning any serious wooden floor installation.