I've always had Lee pots. I am on my third, having had a production pot and two 4-20s. None of them have ever held steady temp for me. This is not so much a problem with iron or aluminium solid molds, but is frustrating with brass hollow-point molds. I have a lot of lee molds but guess what I hardly use any of them anymore because they simply do not bring me the satisfaction that comes with a top quality bullet from a better mold.
Also, they have the absolute worst spouts. Endless problems with dripping or freezing up. A torch has been a companion for a while. They are fine when the pot is new but the longer it goes on the worse it gets before you just want throw the thing through a wall.
That said are the Big Lyman or RCBS bottom pours actually better? They seem to have a built in temperature controller so I expect that to be a vast improvement? Do they hold up better? Is the spout better? Does the mold warming tray actually work?
I cast a few hundred bullets about every weekend, so I use the thing. Maybe lee molds are just not up to that?