So far so good. I bought it because of the variable speed spindle. I'm fed up with the shortened lifespan of grinding/flap discs and spoked wheels. The heat generated when they spin at 11,000 RPM drastically reduces media life. Their slowdown, which can be significant in some cases, reduces heat generation and increases service life. Overall, it appears to be a quality instrument from the flagship TTI brand. I'll update this review if anything about the tool changes significantly, which I'm not expecting.
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