I still have my old MEC 650 from when I was into trap shooting big time. It worked well for me. Yes, there were occasional jams, but nothing I couldn't clear quickly. One of my buddies had a PW and that baby really spit them out. I thought the 650 did a great job for the money.
As far as .410 loading goes, Dan just gave very good advice. Once you find a combo that rolls up nicely, stay with it. Those little buggers are very sensitive to component changes.