I own the old RL1050, a 650 and a 550. The 1050 works great and is a great design, like others have posted the priming system is the weakest link, but with that said, having swaging and a priming on the downstroke make it all worth it. I load 223 on it. There is a learning curve to getting the machine to run smooth.
The 650 is also a great press in my opinion. I will be selling my 550 so I can finance another 650 so I can have a dedicated machine for large primers.