This cup holder works pretty well! It is super easy to clip on to a desk, table, or other overhanging surface; just pull down, slide on, and release. You can fit pretty much any and every size cup, mug, or bottle in the cup holder which is pretty nice. However, since it is relatively large, if it gets bumped you may spill an open container. Also, you have to be able to clip it all the way on otherwise the weight of the container will make it unstable. My desk has brackets under the top which interfere with the cup holder and make it rather unstable if someone bumps into it which happens a lot at my school where I wanted to use this. Overall, solid product especially if it is in a place that will not be bumped into.