I have and use #425, QS, and OCW. I normally use Optimum No Rinse to wash and I love using OCW after washing with ONR before I dry the car. I often use it after every wash. I use the #425 for light dust removal and bug cleaning. I like the QuickShine for the best possible look on my car. It works great on sealants and on carnauba. When the 425 runs out I will only be using the QS. It is my favorite QD ..... period. The OCW looks great and lasts a lot longer but it cannot be used to clean and since you need a QD from time to time QS is a must in my arsenal. I plan to keep both OCW and QS on hand but if I could only use one it would have to be QS.