Only drawback: The accordion folds at the bottom of the files don't easily fold back into place after being expanded. You can easily do it manually but it's not like plastic expanding files that practically pop back into place on their own. No big deal really.
Never had heard about "expandable files" until I took an "Organizing" class 2 weeks ago and the instructor showed them to us! I could have been using them for years instead of paper-clipping folder-filled files that needed to be together! And re-paper-clipping as they never stayed together! Haven't actually put them to use but I know exactly where I'll use them and my files here at home will enjoy a new level of "ORGANIZED"!! Also I like the 4 color choices.