I have 3 of the Lee PPM's and don't use any of them since I purchased an RCBS Competition Powder Measure.
While the Lee worked well with certain powders they are a real PITA to get adjusted (thus the reason I have 3, one for each specific load). What finally did the Lee in for me was when trying to use one for Accurate #5, that powder had so much leakage in the Lee measure it would actually JAM the drum, so I had to stop, take it apart, clean it up, then start all over for perhaps 30 or 40 charges before it jammed again.
Threw it into the trash and got in my car and drove to Cabelas and got the RCBS powder measure. BTW, the RCBS measure DOES NOT LEAK, even with H110. It's also vastly easier to set up because I keep a record of the micrometer setting for every charge weight and powder combination I use. Weak points for the RCBS is the same as those for the Lee, that is that with Stick or large flake powders they just aren't as repeatable as I want to see. Some may not be bothered by an occasional charge being thrown 1/2 grain light or heavy but I am not one of those folks.
BTW, I do a 50 piece capability study and use Statistics to determine what powders are truly Capable in my powder measure and which powders need to have every single charge trickled to a specific weight.
Capable of +/- 0.1 grain repeat-ability to 6 Sigma. All of the Accurate Ball Handgun powders (2, 5, 7, and 9), 2400, IMR SR7625, Vihtavouri 3N37, H110/Win296, CFE Pistol, CFE 223.
Not capable of +/- 0.1 grain repeat-ability to 6 sigma. All of the rifle "stick" powders I have on hand, IMR 4064, 4895 and Varget. In handgun Powders that would be Unique and Longshot. Started with Unique about 10 years ago and still have probably 4/5 of that first bottle because not long after starting I discovered SR7625 and it's wonderful metering qualities. As for Longshot, in the 40 S&W it's the best choice if you want to build ballistic equivalents to the 165 grain Speer Gold Dot high energy 40 S&W (1150 fps).