Was a little disappointed upon unpacking. Seemed kinda of flimsy. After installation I was pleased with the function, but using two in parallel takes some setting. And they no where near lift 220lb each or 440lb for the pair. More likely about 150 for the pair. About 60% loss. But this is likely due to a leverage disadvantage in the design of my project. I have ordered the 660lb units, again a pair. I'm hoping that a 1320lb capacity will give me at least 350lb of lift.