Slightly ridiculous that you can move the columns from left to right but can't sort them, so if you drag a large number of files into it to check, sure it'll find the ones that need fixing, but you've then got to go back through the entire list looking for and finding those randomly placed files to select them to be fixed. You could have it re-write the entire selection of what you dragged into it of course, but if you've put 10,000 files in, and 2000 need fixing....would you take the risk of rewriting and in fact replacing the original of an additional 8000 files that it didn't need to? Ok so the files that needed repairing are then placed in your trash, but imagine having to potentially go back through that to re-replace files that it rewrote not only incorrectly but also unnecessarily. It needs column sorting enabled quite desperately.