I'm sure I have not loaded as many as others responding to your post, but I have used my Lil Dandy to load a few tens of thousand handgun rounds since the early 80s. The only problem I had was cracking the plastic hopper 1 or 2 years ago. I wrote to RCBS who sent me a new one at no cost. Fantastic customer service. I can't say enough good things about my experience with it. Even though it isn't recommended, I bought a few extra rotors and slightly expanded the rotor cup for my pet loads.
I have also owned a Lyman 55 for 20 years, but despite polishing the heck out of the adjustable rotor and housing, it sticks. Since I cant get a consistent throw, I have a difficult time adjusting the amount of powder dropping each time. Tried it with Bullseye, 231/hp-38, Unique, TightGroup, 748, CFE-223, and of course stick powders. Probably haven't loaded more than a couple hundred rounds with it.
I've considered a Uniflow for many years, but since I have all of the Lil Dandy rotors for my handgun rounds and individually weigh my rifle loads, I haven't found the desire to buy another adjustable powder measure which may or may not be better. If I do, it will certainly be a green one.