I've never used this, but, I tested everything on it when I got it and everything works as it should. I would rather have an aluminum floor jack. I have a nice, low profile floor jack, but, I can't lift it in and out of my car. I have sciatica, and, a hernia.
So, if you have one sitting around that you never use and want to trade.......
Actually, I just got this delivered to me, and, I'm not sure it'll fit under the car when it has a flat tire. The jack that came with the car would not fit. I had to call somebody to come out and jack my car up and it cost me a lot of money to change a dang flat tire. I don't have a legal car. I drive it on my dirt road, and at night, when I have to.