Perhaps when Brian says he doesn't recommend a 650 to people new, he means to reloading in general. In that regard, I agree completely. If however you are an experienced reloader, the transition to a 650 shouldn't be difficult. In basic terms, the 650 doesn't do anything not done with a single stage press - except it does it all at once. Just take the time to read the manual, and the video is great too. Don't try to set any speed records and you'll be fine.
Just be aware of one thing: once you get a 650 set up and running, you may want to make Mike Dillon a deity.