I have many, many round crimped with mine in two calibers. No problems at all. I like the ease of adjustment a lot.
I do have one problem right now with a Lee product. I broke half of the screw driver slot on the valve stem for my pro 20 lead pot. I figured I would call and see if I can get another rod, but no answer on the phone and I can't find their email address on their website. I will try and call next week, they may be on vacation or something. Meanwhile I can still use my pot, but to twist the rod to stop the drips I have to use pliers in the pot. That kinda doesn't do it for me.
I am looking at the Lyman pot and may just get one of theirs now that I now know I enjoy casting so much. The Lee was a good place to start.