The case activated charging systems are heavier, and that might be a concern. Probably wouldn't be if LEE didn't use plastic to hold the auto-index rod and why I avoid many LEE products. Cheaper is not better and this kind of points to the error of LEE's philosophy.
I have not used the RCBS system long enough to have any problems, so I can't say they won't occur, but I haven't heard many reports of failure, but with that plastic rod holder failure is likely to occur more rapidly. But, then, I'll just stock up on more of them, or maybe we should lobby LEE to not be so cheap with a mechanical parts prone to wear much faster than even aluminum would.
If you use flake powders, you may not have any problems with the Pro Auto-Disk. I don't and haven't for the past 15 years. One of the many benefits of sphericals, especially the very dense and fine grained ones like True Blue, AA#5, #7, #9 and many magnum spherical powders, is uniformity of chargeweights where flakes simply don't compare. Because after all, we are working with cavities of a given size and gravity to fill that cavity. The higher bulk density or specific gravity is, well, you probably learned that in High School physics. And a powder like True Blue, that can be used in any handgun load/cartridge, can be as much as twice the bulk density of some flake powders.
So, the leaking aspect in itself can be dealt with by sweeping the powder back into its container after loading unless you make so many rounds that the powder starts falling from the PAD. And, of course, YMMV. In my case, the one I had leaked sphericals with bulk densities like ZIP @ 780 grams/liter or .780 grams/CC to include powders like W231, Silhouette and HS-6 although it is higher in bulk density it's somewhat similar in physical size. True Blue? Forget about it, its gonna leak, so I sold mine to a guy on a reloading forum who insisted that the leakage problem wasn't an issue for him and he planned to use flake propellants.
