Please note my initial review was after just one use but the product worked exactly as intended. I felt more confident using it because it is very heavy. I used a rented one before and the whole compressor buckled as soon as I compressed the spring which made me a little nervous. I never felt like this car was going to fail, and a full-size pickup didn't. I've seen people install Doc Stars for lack of instructions, but it's a pretty basic tool and a lot of things don't come with instructions these days because all you have to do is YouTube and you can find instructions for almost anything , so i don't know it's a big problem and if you can't see it and understand how it works then you probably shouldn't be using it and i don't just mean it for people who don't know how that tool works. All in all it was a great product and I will need to replace the shock absorbers at some point in the near future. Financially I could only go up 2 1/2 inches to try and eliminate the tire friction so it could be used again, which comes in handy if you have friends or family who need help. Of course, if something happens or the product fails, I will change my review or add a new one. All in all if you use or need to use a compressor for fairly heavy springs I would recommend this product.