Originally Posted by foosh
I hate to say this, and your experience may be different, but I've had two of the Harbor Freight, low-profile, aluminum floor jacks, and both failed within months. In both cases the hydraulic cylinders failed.
You almost always get what you pay for.
I know a few guys locally who've had the same problem. They said they could literally see the car slowly falling when the cylinder failed while they were under the car!