I've got the Byrnes 5" disc sander. It deserves the same praise for design and quality. For years, I used a nice but less robust Proxxon 5" disc for small jobs. The Byrnes blows the Proxxon out of the water. Its rigidity promotes precision, has a very effective dust collection arrangement and operates quietly. Adjustments are both secure and easy to adjust. The disc is 5/8" thick, which is unusually heavy for a 5". It is very well balanced and runs with remarkable smoothness. Runout is .0003" measured with a dial test indicator (Swiss, of course).
No regrets here about the price.
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