I don't own one but here is a review :
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My new Lyman Brass Smith Powder Measure is a real gem. The directions recommend cleaning the interior thoroughly with alcohol to get rid of any oil that might be present. After I cleaned it, I coated all moving parts with graphite (spray can) including the metering cylinder and metering rod. It is very well made, precision machined with tight tolerances and substantial components. I checked the powder throws for accuracy and repeatability at 6 gr and 24 gr because that is where I will primarily use it. With just a little bit of familiarization I consistently produced throws that varied less than 0.1 gr. It is very easy to use and has many useful features. Lyman has hit a homerun.