I'll be the oddball. I have the Lyman II. The warmup time is a bit of a bear, but you can stop the warmup time and just calibrate it yourself. For small drops like a .223/.243, it will put it in the tray just about as fast as you can put it in the case and seat a bullet. I use it for the longer extruded powders, which do not throw very well.
I know a couple of folks who really like the chargemaster (but that is obvious from the replies). I do not find clean up to take too long, and I have found it to be consistent. If you are an RCBS fan, go with the chargemeaster, you will always second guess yourself if you don't. If your bench looks anything like mine with various and sundry name brands floating around, I would think either is a good choice.
RB