The plastic these are made from is better than the rest simply because if you buy cheap rulers the edges dull very quickly, this one seems to be stronger than the rest and has a nice styling of the measurments.
A ruler's a ruler isn't it? It seemed good quality. Clear markings important for me to measure in millimeters.. Sadly I left it behind on a train where working. Moral- don't do this sort of work on a train! Have already replaced this with similar bought in a supermarket, cheaper. Adequate.