I bought these to replace my 15 year old slides which I thought were getting rougher and rougher to use. These new slides look almost identical to my old ones. Unfortunately, slides from 15 years ago ran smoother than this one. On older ones you can spin the wheel with your finger and it will keep turning like a ball bearing wheel. Not so on these new ones. I can't recommend it as a replacement. The prices are reasonable, hence the two stars.