[Chris is me]

I'd say a little over half of the Wisconsin Regional matches involved a Supercell.

It seems a lot of teams have incorproated some sort of belt reversal / empty cell conversion as a "cop out function" on their robots; something they add in case their manipulator fails or the strategy calls for something different. Robots designed with the empty cell in mind that are quick and mobile, able to convert most or all of them in under a minute, will score themselves a great niche on alliances, especially if the robot can do something with the Supercell once it's in play.