I just installed 9 of the 10 slides that were in the order. One set of guides had the ball bearings fail and fall out of the pocket they were in. Of the 9 I installed these were very easy to install considering I was replacing old rails. What I see is that the soft close mechanism works differently on drawers. Some work great, others tend to get stuck or the drawer is difficult to open. You would think they would all work the same but mine is not sure if mine is just a bad batch. What I actually found is that silicone spray helps in this situation. Lots of splashes. That's why I only gave 3 stars.