I like all of the QD's I've tried but I buy my QD in bulk from top of the line detailing, its alot cheaper that way. When you detail cars on the side like I do you tend to through QD when claying, so it makes more sense to do it this way. I've used Mequiars, Turtle Wax Ice, Clay Magic lub, Mothers, etc and they all do a nice job. I've also used Mequiars #34 Final Inspection, good stuff and it can be bought in bulk and is very reasonably priced.