My Loadmaster worked very well until I wore it out! Well actually there are a few trouble spots to watch for and fix before you keep going and get frustrated! The primer feeder and mostly the primer plunger is the biggest potential problem.
Once it is set up it works very well. It isn't hard to set up either. The feeder needs to be clean and free of any dirt or primer residue. As mentioned, do not oil or grease it. You can treat it with armour-all or nu-finish, but it must be wiped off.
The shell plate needs very minor lubrication on the spindle and the advance rod. Too much and powder sticks creating timing problems.
You will find the turret locking screw will always come loose, especially with 9mm due to press vibration. The shell plate thumb bolt will also loosen off, even with the O-ring installed. You need these to be tight to ensure proper primer depth seating.
Now to deal with the problem child. Lots of You-tube videos, but most of the fixes don't really address the problem. As i said, I wore mine out! 12,000+ rounds and it really didn't prime properly for the last 4,000 or so. What I found was the primer plunger was angling out radially which caused tipped primers and crescents (smiley faces). Nothing was wrong with the alignment or carrier, it was the plastic piece that holds/guides the primer pin. There is a small spring that sits under the primer pin that creates pressure against the plastic edge of the guide. As it wears the pin angles further out until it starts to give small problems, occasionally tipped primers that fall off, or those that go in 90* off axis. As it gets worse the smiley faces show up and the priming can be a royal PITA. If you let the shell float outward at that station, results can be satisfactory but it will get worse. If you use an alignment die in your turret, the problem just became a show stopper!
The plastic parts (feeder ramp) is cheap and should be replaced when problems start showing up. I chose to NOT put the spring back under the primer pin to prevent or hopefully delay the problem from coming back. I have made another 1,000 rounds in the past week with perfect results.
Overall it works very well, but it can be frustrating when you don't know what is wrong. All of the other brands have their issues as well, but the 650XL with accessories is almost triple the price. Many people seem to forget this is a progressive press. If you only want to do one or 2 stages at a time, then use a simpler press.