As an industrial and scientific buyer I was hesitant to try new bearings, but my analysis of this product showed that it exceeded my expectations.The OctagonStar Mounted Pillow Insert Bearing exceeded all my requirements for durability, smooth operation, and precision. The pros of this product include long-lasting performance and ease of installation, making it an excellent choice for power transmission products. The only con I noticed was that it was slightly noisier than other bearings on the market, but it was a minor issue that did not affect its performance. Overall, I highly recommend this product for anyone LOOKING for reliable bearings..