The internet makes them seem more terrifying than they are.

Finally got to see one of these things.  It was leashed - not tethered.

They were showing off how well it was able to balance on this rolling cylinder.  The setup was more like those old timey pendulum swings that you played on as a kid. It was not free roaming. I imagine you wouldn't be as impressed because even robotic arms are still really slow and methodical. The power of the internet though makes them scaaaareeeeey.