I find the Ranking Comparison tables in the Visibility reports to be especially useful, because it summarizes how keywords within groups have moved into and out of important ranking tiers. I would like the option to switch the variance value from absolute volume (which currently appears in green or red with an arrow up or down) to a percent variance/change. It would help to give a quick read on whether the change within that category is significant or not.

I attached a screenshot to show which view I'm talking about. I'm talking about the values in green.