Currently if I receive a file where fields are empty rather than Null(), the summarize won't count them with the CountNull option. Fairly easy to put a formula right before when there is just a couple of fields and change with an IF IsEmpty() but with a file with a large number of fields and large file size, a multiple field tool eats up a lot of time converting. Not sure if it would just be trading processing speed in the summarize to do basically the same thing.