I've had my 7" snowflake less than 3 months, and I've been bitten more times than I can count. Once, he latched on and held on till I raised my hand, eel dangling, clear of the tank and he dropped to the floor.
Besides that, an ocellaris clown, a purple tang (?!), and a niger trigger
Just bought a clown trigger, haven't tried hand feeding, but he'll get me one day.