I bought it for movie shooting, but it did not move smoothly and it was not used at all. I think that there is no problem if it is used for slide rails such as drawers, but it is not good to use for taking pictures. Returns are also NG, so be careful who you are thinking for shooting.
Since the commercially available camera slider is expensive from 1.5 to several ten thousand yen, we made a self-made camera slider with a tripod hole etc. based on this roller back as the base. If it is rigid and has a camera up to 2 kg, it made it move smoothly without problems. I was satisfied because I was able to do it at a fraction of the cost of commercial products. In addition, it was still better if the weight was a little more.