The Sutton shower panel is awesome. It has features which would cost over $1000 from companies like Kohler, Moen or Delta at less than half the price. On top of that, it just looks really cool. The top knob is the diverter which sends the water to your choice of the rainfall showerhead, the handheld wand or the body jets on the panel itself. Only one output works at a time which reduces water heating costs and helps protect the environment. The middle knob turns the water supply on and off and controls the volume. The bottom knob controls the thermostatic valve. Set it and forget it.  The water will always be the temperature you want it to be. No more turning the water up and down a little to get it right. The plumbing needed to do all of these things is contained inside the panel. All that you have to do to install it is connected to the water supply.  There is no rough in valve needed since it is included inside the panel. It is simply an awesome product at an awesome price.