I've never heard of anyone being happy with a Lee progressive. Single stage sure. Get a Dillon.
Well let me be the first.
I've had two Loadmasters for at least 25 years. Paid $140 each for them new. I have lost track of how many tens of 1000's of rounds I have loaded with them.
I am always mystified by people who complain about the primer feeder. The secrets to the primer feeders are: 1. keep them clean 2. since they are gravity fed keep a good reserve of primers in the tray so there is adequate pressure on the primers in the chute. These two things will eliminate the vast majority of priming problems. I lose perhaps 2 or three primers every 500 rounds and the ones that are inserted upside down can even be reused.
As for the case feeder, the key is to put the correct amount of pressure on the plastic housing the guide rod fits into. Too much pressure and the housing will bind. Too little pressure and the cases will not be fed fully into the shellplate but adjustment is as simple as turning the tension screw. The case feeder funnel and tube assembly is amazing in its simplicity. For about $50 it basically does the same thing as the Dillion or Hornady case feeders that will cost you over $400.
The bullet feeder is not worth the money and you can feed bullets by hand just about as fast.
Obviously the Dillons are an upgrade from the Lee. If they weren't who would buy them? However, you're also looking at 3-4 times the cost depending on which Dillon accessories you add on. A Hornady progressive will be 2-3 times the cost, again depending on the add-ons. And please do not be misled by people who tell you that press "X" or press "Y" is trouble free compared to the Lee. Several of my friends have various models of Dillons and at one time or another all of their presses have required replacements for broken parts. No machine is infallible no matter how good it is. Even Ferraris break down from time to time.
Luckily I'm not completely mechanically illiterate and the longer I've had the Loadmasters and learned their intricacies the quicker I can fix them if something goes wrong (which to be honest isn't that often).
As OldDude noted, if you've got lots of money buy the Dillon (or the Ferrari). Who wouldn't? But if you're like a lot of people and aren't rolling in dough, with a little patience and research (YouTube if full of instructional videos) the Lee will serve you well.