I started out, years ago, with an RCBS Uniflow and used it for everything. 3 or 4 years ago I bought a Lee "Perfect" measure, mostly because my brothers all used that model, and because they were on sale for less than 20 bucks. Since then, I've used both, on and off. The Lee throws very uniform charges with stick-type powders, but seems to leak a little with flake and ball powders. Another downside I've noticed with the Lee is that if you want to change powder volume, that adjustment screw becomes harder and harder to turn as time goes by. I even bought a cheap socket and ratchet to turn it with a while back. That having been said, an upside with Lee is that if you want to empty the unit out to change types of powder, it's really easy to just turn the container half a turn, remove it and empty the powder back into its original container. With the RCBS you have to take the whole measure out of its holder. For smaller volumes of certain calibers, I have pretty much gone back to my RCBS unit. Both Lee and RCBS units work well enough, though. I've even given some thought to buying a couple more Lee's, next time they are on sale, setting them up and labelling them for a dedicated, favorite load, and using them strictly for single caliber-single load purposes--maybe for something like 30 grains of 3031 for one of my favorite loads for a favorite caliber.