Review on ReliaBot MGN9C Carriage Linear Motion by Michael Vargas

Inexpensive, but very smooth-running! It is said that Chinese splints are always sticky and/or rough and filled with thick factory grease. This seems to be an exception. It arrived in sealed packaging with light oil and is packaged in a zip bag with a few extra bearings (which appear to be slightly larger than the standard Chinese mgn9 bearings, which I take as a mark of quality, but be aware). They run fairly smoothly and slide on the rails themselves (unlike some other cheap rails). All in all, if you're looking for functional yet affordable linear guides, then you've come to the right place.