I have been using a Lee PPM for 30 years, off and on, and now just use it on occasion. My PPMs were just about as accurate with some powders as any powder measure on the market. But like every tool there are some things about it that some don't like. My PPM leaked fine ball powder until I "lapped" the drum. My PPM felt "gritty" with some log powders until I squirted graphite in the drum and adjusted the drum/frame clearance (not 100% fix, but better). I didn't like the "springy" feeling when running the handle through a full stroke until I reinforced the mounting system. As it stands, my PPM is just a bit slower then my C-H 502, a bit more friction as it runs through a cycle, but nearly as accurate (I once ran a hopper full of W231 through it with less than .1 grain variation per charge...