I love the Lee Factory Crimp Dies...........the loading dies.......I am kinda up in the air about. I have RCBS, Lyman, Redding, Lee, and Hornady dies on my bench right now, so I am not really a brand snob, but the Lee dies are at the bottom of the favorites list. They seem to work just fine, and I have had no problems with them.........so far. But, handling them, they feel.....kinda cheap to me, compared to my other die sets. The no lock ring thing kinda bugs me too, but isnt a huge deal. The biggest thing that bothers me when using my Lee dies, is the sliding expander for the expander die in my 9mm set. None of my other pistol dies have it, and that dang thing thunking up and down with each stroke of the press just drives me nuts!
I got my dies for $13.99 (and they were the only set of 9mm dies I could find within about 150 miles at the time), and for the money, they havent been too bad, but I don't think I would buy another set.
If I had to pick a favorite brand, I would be hard pressed to pick between the RCBS and Lyman dies.