Speaking of "staying safe," I have a neighbor friend who, about 15 years ago, literally shredded his right hand right down to the wrist in a shredder accident. So I am very much aware of what can happen if you are careless and don't observe all the safety precautions.
As far as getting "sucked in" I feel the BX62 that I have is very safe. It will beat you up and hurt you with branches whipping around, but the feed chute is quite deep and it doesn't grab and pull stuff in with such force that it would pull me in with it unless I was being careless, even then I'm not sure it could actually happen. And I don't want to find out.
For the chippers, at least, I feel the big dangers are noise, eye injuries from chips and debris, and cuts and abrasions from the branches being fed. Beyond that, following all the safety rules will minimize the danger.
I can't imagine (actually I can, I've worked in a trauma center) the horror of loosing a hand to a shredder. Lots of risk in what we do!