These cheap MGn style rails have a reputation for success or failure. At the same time, the one I had runs smoothly with some preload. Pretty quiet after flushing and relubricating. Given that it costs at least 5 times less than branded rails and that they would be perfect for my needs, I like it. Be sure to remove the screws that attach the ends to the sled. Sometimes they get cramped on these rails, which can cause binding. The downsides are that they weren't packaged well for precision linear rails. Just in a plastic bag in a box with another heavy item in my order. There are scratches on the rail, marks that would be unacceptable without the price. Will be a good Y axis for my 3D printer.
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