I got the kit for all 4 wheels for my Datsun 280ZX. The installation instructions are very easy to follow, but it is a lot of work if you want to do a clean installation. I also opted for a second button so I have the front and rear cups to be activated independently. The cups work perfect and they make the difference when going through a speed bump or having to enter a parking (it helps a lot, but doesn't save you in all cases if you are really low). The only drawback is the stiffness on the suspension when the car is lifted, as in my particular case it can't lift all the 5cm (only 3,8cm) and the system then compresses the spring, making the car feel like it has no suspension at all, having to go through the speed bump at 5 kmh. But that is better than scratching your bumper or the underbody right? XD Overall, a must if you want to lower the car, and the quality of every part is amazing. Also, great customer support.