I have no problems from my new lee ( well it was new about 2 years ago).
I did like the round tray better but as to operation it works as well as the old one for me?
now I have replaced at least 2 if not 3 over the years as they began to do exactly what yours did, not seating the primer deep enough, I looked the mechanism and the rod had worn down from use over the years just enough to cause a slightly high primer.
maybe that was the problem with yours.
anyway that's my story and I am sticking to it.
That's what I was thinking-- that I slap wore it out! But it takes experience to figure that out, and my problem was "revolver doesn't go bang any more". I don't like that. But figured out and fixed.
BTW, Dillon owners-- if you don't have your process under control in tightening down the shell plate you can have the same problem. I'm an expert now, but I've had some issues with that over the years. Got to get that sucker down tight. Or you'll have some "clicks" when you expect "bangs". Well, assuming you've lightened the revolver mainspring. If you're running a factory setup, you'll never notice.
FWIW, I know what I'm doing, and the RCBS is a functional improvement over the Lee, random "crowd" ratings notwithstanding. It also works with shells that won't fit in the Lee. Like .470 NE, but that's not a common situation. I wish I could say that was "my" problem, but alas, I load that for a friend. Fun to shoot though.