In late 2018 I purchased 2 of these sets to set up chairs in an area we often rearrange for different gatherings. Installation was relatively easy. I bolted the 2x4 pieces to the bottom of the chairs, mainly to raise them an additional 1.5 inches since the casters were a lot smaller than the legs they replaced. Since installation, the chairs have been moved (rolled) once a week on average. The floor is covered with Berber carpet and the rollers work well on it. No issues so far - the reels have been solid and worked as expected. To echo some of the other comments, it can be difficult/difficult/impossible to place the screws flush with the base plate of the roller. I didn't find this to be a problem after installing it. YMMV.
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