We needed a single tab top opening folder for a large ongoing project. We would have preferred a reinforced top which the clerk said was not available in a single tab folder. That may become an issue but the biggest issue at the moment is the number of paper cuts the sharp edges have caused and the general lightweight quality of stock.
The single tab folders are great for anybody who uses folders on an ongoing basis like I do. Rather than just for filing stuff that does not get used again. The single tabs won't get folded over and get worn out and decrepit. Plus can scratch out the old labels and write new labels easily.