You are right about consistency. Once I have gotten used to a mouse, the feel of any other mouse is a bit off or wrong. This kind of data is a chance to understand how off a mouse really was. If lets say you want to change to a different mouse, you can confidently know what the difference would be, and be prepared for it.
I have the G502 wired, but a family member has the G Pro SuperLight. It felt light and really smooth, but my brain couldn't really tell what really was different between the two. Without bringing my mouse over and match my own settings, its hard to tell exactly non-subjectively how they perform side by side. Or simply buy it and try it out.